期末试卷1
青岛版七年级下册数学期末试卷 (1)

青岛版七年级下册数学期末试卷一、选择题(共12小题,每小题3分,在每小题给出的四个选项中,只有一项符合题目要求)1.(3分)在平面直角坐标系中,点P(﹣3,1)所在的象限是( )A.第一象限B.第二象限C.第三象限D.第四象限2.(3分)已知是方程x+ay=3的一个解,那么a的值为( )A.1B.﹣1C.2D.﹣23.(3分)2020年1月12日,世界卫生组织正式将2019新型冠状病毒命名为2019﹣nCoV.该病毒的直径约0.00000006米﹣0.00000012米,将0.00000012用科学记数法表示为a×10n 的形式,则n为( )A.﹣8B.﹣7C.7D.84.(3分)如图,将一个三角板60°角的顶点与另一个三角板的直角顶点重合,∠1=27°40′,则∠2的度数是( )A.27°40′B.62°20′C.57°40′D.58°205.(3分)已知a=(﹣3)0,b=,c=(﹣2)﹣2,那么a,b,c的大小关系为( )A.a>b>c B.c>b>a C.b>a>c D.c>a>b6.(3分)(﹣5a2+4b2)( )=25a4﹣16b4,括号内应填( )A.5a2+4b2B.5a2﹣4b2C.﹣5a2﹣4b2D.﹣5a2+4b2 7.(3分)下列计算中正确的是( )A.2a6÷a3=2a3B.(2ab2)2=2a2b4C.2a2+3a2=5a4D.(a2)3=a58.(3分)《孙子算经》中有一道题,原文是:“今有木,不知长短,引绳度之,余绳四尺五寸;屈绳量之,不足一尺,木长几何?”意思是:用一根绳子去量一根长木,绳子还剩余4.5尺;将绳子对折再量长木,长木还剩余1尺,问长木多少尺?如果设长木长x尺,绳长y尺,则可以列方程组( )A.B.C.D.9.(3分)如图,△ABC中,D,E分别是BC,AD的中点,若△ABC的面积是10,则△ABE的面积是( )A.B.3C.D.510.(3分)已知a=2b﹣5,则代数式a2﹣4ab+4b2﹣5的值是( )A.20B.0C.﹣10D.﹣3011.(3分)如图,五边形ABCDE是正五边形,若l1∥l2,则∠1﹣∠2的值为( )A.120°B.108°C.90°D.72°12.(3分)如图,在平面直角坐标系中,放置半径为1的圆,圆心到两坐标轴的距离都等于半径,若该圆向x轴正方向滚动2017圈(滚动时在x轴上不滑动),此时该圆圆心的坐标为( )A.(2018,1)B.(4034π+1,1)C.(2017,1)D.(4034π,1)二、填空题(本题共5个小题,每小题3分,共15分,只要求写出最后结果13.(3分)已知方程3x+2y=6,用关于y的代数式表示x,则x= .14.(3分)在平面直角坐标系中,已知点A(2,﹣1),过点A作AB∥x轴,且AB=3,则点B的坐标是 .15.(3分)已知二次三项式x2+px+q因式分解的结果是(x﹣3)(x﹣5),则p+q= .16.(3分)已知点A(0,0),B(4,2),C(2,5),则△ABC的面积是.17.(3分)一机器人在平地上按如图设置的程序行走,则该机器人从开始到停止所行走的路程为 .三、解答题(本大题共8小题,共69分.解答要写出必要的文字说明、证明过程或演算步骤.)18.(5分)解方程组:.19.(12分)计算:(1)(﹣x)5•x÷(﹣x2);(2)(﹣2x)3(x2﹣12x+1);(3)﹣x(2x+1)﹣(2x+3)(1﹣x).20.(12分)分解因式:(1)(m+n)2﹣6(m+n)+9;(2)x3﹣x;(3)(a﹣b)(5a+2b)﹣(a+6b)(a﹣b).21.(8分)如图,在△ABC中,D是BC边上的一点,∠B=45°,∠BAD=30°,将△ABD 沿AD折叠得到△AED,AE与BC交于点F.(1)求∠AFC和∠EDF的度数;(2)若∠E:∠C=3:2,问:DE∥AC吗,请说明理由.22.(6分)如图所示,小刚家门口的商店在装修,他发现工人正在一块半径为R的圆形板材上,冲去半径为r的四个小圆,小刚测得R=6.8dm,r=1.6dm,他想知道剩余阴影部分的面积,你能利用所学过的因式分解的知识帮助小刚计算吗?请写出求解过程(结果保留π).23.(8分)已知:a﹣b=6,a2+b2=20,求下列代数式的值:(1)ab;(2)﹣a3b﹣2a2b2﹣ab3.24.(8分)阅读例题的解答过程,并解答(1)(2)两个问题.例:计算(a﹣2b+3)(a+2b﹣3)=[a﹣(2b﹣3)][a+(2b﹣3)]①=a2﹣(2b﹣3)2②=a2﹣4b2+12b﹣9③(1)例题求解过程中,利用了整体思想,其中①→②的变形依据是,②→③的变形依据是.(填整式乘法公式的名称)(2)用此方法计算:(a+2x﹣y﹣b)(a﹣2x+y﹣b).25.(10分)某中学七年级数学课外兴趣小组在探究:“n边形(n>3)共有多少条对角线”这一问题时,设计了如下表格,请在表格中的横线上填上相应的结果:应用得到的结果解决以下问题:①求十二边形有多少条对角线?②过多边形的一个顶点的所有对角线条数与这些对角线分多边形所得的三角形个数的和可能为2016吗?若能,请求出这个多边形的边数;若不能,请说明理由.参考答案与试题解析一、选择题(共12小题,每小题3分,在每小题给出的四个选项中,只有一项符合题目要求)1.【分析】根据点的横纵坐标的符号可得所在象限.【解答】解:∵﹣3<0,1>0,∴点P(﹣3,1)所在的象限是第二象限,故选:B.2.【分析】把x=2,y=﹣1代入方程x+ay=3得出方程2﹣a=3,再求出方程的解即可.【解答】解:∵x=2,y=﹣1是方程x+ay=3的一个解,∴2﹣a=3,解得:a=﹣1,故选:B.3.【分析】绝对值小于1的数也可以利用科学记数法表示,一般形式为a×10﹣n,与较大数的科学记数法不同的是其所使用的是负整数指数幂,指数n由原数左边起第一个不为零的数字前面的0的个数所决定.【解答】解:0.00000012=1.2×10﹣7,∴n=﹣7.故选:B.4.【分析】根据∠BAC=60°,∠1=27°40′,求出∠EAC的度数,再根据∠2=90°﹣∠EAC,即可求出∠2的度数.【解答】解:∵∠BAC=60°,∠1=27°40′,∴∠EAC=32°20′,∵∠EAD=90°,∴∠2=90°﹣∠EAC=90°﹣32°20′=57°40′;故选:C.5.【分析】根据负整数幂的意义以及零指数幂的意义即可求出答案.【解答】解:a=1,b=3,c=,∴c<a<b,故选:C.6.【分析】根据平方差公式的逆用找出这两个数写出即可.【解答】解:∵(﹣5a2+4b2)(﹣5a2﹣4b2)=25a4﹣16b4,∴应填:﹣5a2﹣4b2.故选:C.7.【分析】直接利用整式的除法运算法则以及积的乘方运算法则、合并同类项法则、幂的乘方运算法则分别计算得出答案.【解答】解:A.2a6÷a3=2a3,故此选项符合题意;B.(2ab2)2=4a2b4,故此选项不合题意;C.2a2+3a2=5a2,故此选项不合题意;D.(a2)3=a6,故此选项不合题意;故选:A.8.【分析】直接利用“绳长=木条+4.5;绳子=木条﹣1”分别得出等式求出答案.【解答】解:设木条长x尺,绳子长y尺,那么可列方程组为.故选:D.9.【分析】设△ABE的面积为x.利用三角形中线的性质推出△ABC的面积为4x,由此构建方程,可得结论.【解答】解:设△ABE的面积为x.∵E是AD的中点,∴AE=DE,∴S△ABE=S△BDE=x,∵D是BC的中点,∴BD=CD,∴S△ABD=S△ADC=2x,∴S△ABC=4x=10,∴x=,故选:C.10.【分析】首先根据a=2b﹣5,可得:a﹣2b=﹣5;然后把代数式a2﹣4ab+4b2﹣5化成(a﹣2b)2﹣5,求出算式的值即可.【解答】解:∵a=2b﹣5,∴a﹣2b=﹣5,∴a2﹣4ab+4b2﹣5=(a﹣2b)2﹣5=(﹣5)2﹣5=25﹣5=20.故选:A.11.【分析】过点B作直线BF∥l1,利用平行线的性质推导出∠1+∠3=180°,∠2+∠3=108°,两个式子相减即可.【解答】解:过点B作直线BF∥l1,∵l1∥l2,∴BF∥l2,∴∠2=∠4,∠1+∠3=180°①,∵正五边形的内角度数为:=108°,∴∠3+∠4=∠ABC=108°,∴∠2+∠3=108°②,①﹣②得∠1﹣∠2=180°﹣108°=72°.故选:D.12.【分析】由已知可得开始时该圆的圆心坐标为(1,1),在圆向右滚动时纵坐标不变,当该圆向x轴正方向滚动2017圈后,横坐标增加2017×2π,从而得到该圆向x轴正方向滚动2017圈后的圆心坐标.【解答】解:∵半径为1的圆,与两坐标轴相切,∴开始时该圆的圆心坐标为(1,1),∵圆的周长为2π,该圆向x轴正方向滚动2017圈,∴圆心的横坐标为1+2π×2017,纵坐标为1,即该圆的圆心坐标为(4034π+1,1).故选:B.二、填空题(本题共5个小题,每小题3分,共15分,只要求写出最后结果13.【分析】将y看作已知数,求出x即可.【解答】解:3x+2y=6,解得:x=.故答案为:.14.【分析】在平面直角坐标系中与x轴平行,则它上面的点纵坐标相同,可求B点纵坐标;与x轴平行,相当于点A左右平移,可求B点横坐标.【解答】解:∵AB∥x轴,∴点B纵坐标与点A纵坐标相同,为﹣1,又∵AB=3,可能右移,横坐标为2+3=5;可能左移横坐标为2﹣3=﹣1,∴B点坐标为(5,﹣1)或(﹣1,﹣1),故答案为:(5,﹣1)或(﹣1,﹣1).15.【分析】直接利用多项式乘多项式运算法则得出p,q的值,进而得出答案.【解答】解:∵x2+px+q=(x﹣3)(x﹣5),∴x2+px+q=x2﹣8x+15,故p=﹣8,q=15,则p+q=﹣8+15=7.故答案为:7.16.【分析】利用分割法把三角形面积看成矩形面积减去周围三个三角形面积即可.【解答】解:如图,S△ABC=4×5﹣×2×4﹣×2×3﹣×2×5=8,故答案为:8.17.【分析】该机器人所经过的路径是一个正多边形,利用360°除以45°,即可求得正多边形的边数,即可求得周长,即所行走的路程.【解答】解:该机器人所经过的路径是一个正多边形,360°÷45°=8,则所走的路程是:4×8=32(m).故答案为:32m.三、解答题(本大题共8小题,共69分.解答要写出必要的文字说明、证明过程或演算步骤.)18.【分析】方程组整理后,利用加减消元法求出解即可.【解答】解:方程组整理得:,①+②得:﹣6y=6,解得:y=﹣1,把y=﹣1代入②得:x﹣2=1,解得:x=3,则方程组的解为.19.【分析】(1)原式利用幂的乘方与积的乘方运算法则,以及单项式乘除单项式法则计算即可得到结果;(2)原式利用幂的乘方与积的乘方运算法则,以及单项式乘多项式法则计算即可得到结果;(3)原式利用单项式乘多项式法则,以及多项式乘多项式法则计算即可得到结果.【解答】解:(1)原式=﹣x5•x÷(﹣x2)=﹣x6÷(﹣x2)=x4;(2)原式=﹣8x3(x2﹣12x+1)=﹣8x5+96x4﹣8x3;(3)原式=(﹣2x2﹣x)﹣(2x﹣2x2+3﹣3x)=﹣2x2+x﹣2x+2x2﹣3+3x=2x﹣3.20.【分析】(1)把(m+n)看成一个整体,运用完全平方公式;(2)先提取公因式x,再用平方差公式;(3)先提取公因式,再写成幂的形式.【解答】解:(1)原式=[(m+n)﹣3]2=(m+n﹣3)2;(2)原式=x(x2﹣1)=x(x+1)(x﹣1);(3)原式=(a﹣b)(5a+2b﹣a﹣6b)=(a﹣b)(4a﹣4b)=4(a﹣b)2.21.【分析】(1)根据折叠求出∠BAD=∠DAF,根据三角形外角性质求出∠AFC的度数,由三角形内角和定理求出∠ADB,求出∠ADE,根据三角形外角性质求出∠ADF,即可求∠EDF的度数;(2)由题意可得∠C=∠EDF=30°,即可证DE∥AC.【解答】解:(1)∵△ABD沿AD折叠得到△AED,∴∠BAD=∠DAF,∵∠B=45°,∠BAD=30°,∴∠AFC=∠B+∠BAD+∠DAF=105°;∵∠B=45°,∠BAD=30°,∴∠ADB=180°﹣45°﹣30°=105°,∠ADC=45°+30°=75°,∵△ABD沿AD折叠得到△AED,∴∠ADE=∠ADB=105°,∴∠EDF=∠ADE﹣∠ADC=105°﹣75°=30°.(2)DE∥AC理由如下:∵△ABD沿AD折叠得到△AED,∴∠B=∠E=45°∵∠E:∠C=3:2∴∠C=30°∴∠C=∠EDF=30°∴DE∥AC22.【分析】根据剩余部分的面积=圆形板材的面积﹣四个小圆的面积,即可求解【解答】解:根据题意有:剩余部分的面积=圆形板材的面积﹣四个小圆的面积.剩余部分的面积=πR2﹣4πr2=π(R2﹣4r2)=π(R+2r)(R﹣2r),将R=6.8dm,r=1.6dm代入上式得:剩余部分的面积=π(R+2r)(R﹣2r)=π(6.8+3.2)(6.8﹣3.2)=36π(dm2).答:剩余部分的面积为:36πdm223.【分析】(1)把a﹣b=6两边平方,展开,即可求出ab的值;(2)先分解因式,再整体代入求出即可.【解答】解:(1)∵a﹣b=6,a2+b2=20,∴(a﹣b)2=36,∴a2﹣2ab+b2=36,∴﹣2ab=36﹣20=16,∴ab=﹣8;(2)∵a2+b2=20,ab=﹣8,∴﹣a3b﹣2a2b2﹣ab3=﹣ab(a2+2ab+b2)=﹣(﹣8)×(20﹣16)=32.24.【分析】(1)利用平方差公式,以及完全平方公式判断即可;(2)原式结合后,利用平方差公式,以及完全平方公式化简即可.【解答】解:(1)例题求解过程中,利用了整体思想,其中①→②的变形依据是平方差公式,②→③的变形依据是完全平方公式;(2)原式=(a﹣b)2﹣(2x﹣y)2=a2﹣2ab+b2﹣4x2+4xy﹣y2.故答案为:(1)平方差公式,完全平方公式.25.【分析】①由表格探求的n边形对角线的总条数:得出最终结果;②根据从n边形的一个顶点出发可引(n﹣3)条对角线,这些对角线分多边形所得的三角形个数为(n﹣2).【解答】解:①把n=12代入得,=54.∴十二边形有54条对角线.②不能.由题意得,n﹣3+n﹣2=2016,解得n=.∵多边形的边数必须是正整数,∴过多边形的一个顶点的所有对角线条数与这些对角线分多边形所得的三角形个数的和不可能为2016.。
技师学院职业技术学院试题选择题期末试卷含答案《机械常识与维修基础》期末考试 (1)

2020-2021-1《机械常识与维修基础》期末考试您的姓名: [填空题] *_________________________________1. 下列零件属于专用零件的是() [单选题] *A.螺母B.齿轮C.活塞(正确答案)D.轴承2. 下列运动副属于高副的是() [单选题] *A.曲轴和曲轴轴承B.齿轮与齿轮(正确答案)C.连杆与活塞D.螺栓与螺母3. V带轮的材料常采用() [单选题] *A. 灰铸铁(正确答案)B. 45钢C. 青铜D. 铝4. 带传动时要求小带轮的包角α() [单选题] *A. ≥120°(正确答案)B. ≥100°C. ≤100°D. ≤90°5. 带传动的轮槽形状是() [单选题] *A. 矩形B. 梯形(正确答案)C. 圆形D. 三角形6. 链传动一般布置在机械传动系统中的。
[单选题] *A、高速(正确答案)B、低速C、任何7. 链条的基本参数是 ()。
[单选题] *A、节距(正确答案)B、销轴直径C、滚子直径8. 滚动轴承的特点不包括 ()。
[单选题] *A、起动力矩小,可在负载下起动(正确答案)B、可同时承受径向、轴向载荷C、承受冲击载荷能力强D、不需要有色金属9. 齿数不影响传动比的大小,只改变后面齿轮的转向的齿轮是 ( ) 。
[单选题] *A、太阳轮B、惰轮(正确答案)C、行星轮10. ( )构造最简单,但易磨损,只适用于作用力不大和速度较低的场合。
[单选题] *A、尖顶式从动件(正确答案)B、滚子式从动件C、平底式从动件11. 滚动轴承的组成不包括 ( ) 。
[单选题] *A、内圈B、滚动体C、轴瓦(正确答案)12. 滑动轴承的特点不包括 ( )。
[单选题] *A、起动力矩小,可在负载下起动(正确答案)B、高转速、长使用寿命C、承受冲击载荷能力强D、需要有色金属13. 链传动中链条的节数采用()最好。
武汉大学化学工程基础期末考试试卷1

武汉大学化学与分子科学学院2001—2002学年度第二学期期末考试《化学工程基础》试卷系 专业 年级 学号 姓名 成绩一、填空(每空1分,共20分)1、用测量氢气的转子流量计测量空气时,若转子高度在10L/min 处,则其实际流量 10L/min 。
(=,>,<)2、用饱和蒸气加热某有机化合物时,逆流的平均温差应 并流时的平均温差。
(=,>,<)3、流体在由Ø25×2.5mm 及Ø57×3.5mm 钢管组成的套管换热器环隙中流动,其当量直径为 。
4、当理想流体在水平变径管路中作连续定态流动时,在管路直径缩小处,其静压强将 ,而流速将 (增大或减小)。
5、对于平行反应A ,若主反应级数小于副反应级数,为提高R 的选择性,以选择 反应器为宜。
R S (主反应) (副反应)6、对于在一定条件下进行的简单反应,达到某一转化率所需的活塞流反应器容积与全混流反应器容积之比随转化率增加而 ,随反应级数的增加而 。
7、若以σ2表示有量纲方差,则具有σ2=τ2的反应器模型是 ,σ2=0的反应器模型是 。
8、反应器热稳定的条件是 和 。
9、超滤、反渗透、电渗析和气体膜分离等膜分离过程中,推动力类型不同的膜分离过程是 。
10、对可逆放热反应,平衡温度和最佳温度的大小关系为:平衡温度 最佳温度。
11、描述酶催化反应的米氏方程为m s s max p K C C r r +=,酶催化反应表现为一级反应的条件是 ;表现为0级反应的条件是 。
12、减小竞争性抑制作用的措施是 。
13、稀释率的定义式为D = ,类似于化学反应工程中的 ,D 的值应 D crt (=,<,>)。
二、判断题(下列命题中,你认为正确的,请在题后括号内打“√”,错误的打“×”,每小题2分,共14分)1、粘度的国际单位是厘泊。
( ) 2、返混对于自催化反应总是有益的。
廷坪中心小学六年级期末复习试卷1

廷坪中心小学六年级期末复习试卷(一)班级:姓名:成绩:第一部分基础知识积累和运用一、读拼音,写词语。
(8分)shēn qū yùn cáng jìng mìxī liú()()()()qíyìjiāo xiǎo màn yïu qīn wěn ()()()()二、比一比,再组词。
(8分)邀()俏()侠()巷()遨()峭()陕()卷()冠()瀑()俯()庞()寇()爆()府()宠()三、在()里选出正确的读音,用“√”标出来。
(4分)1.岁月悠悠,波光明灭,泡沫聚散(sǎn sàn ),唯有你依然如旧。
2.它们有时几个吧,散(sǎn sàn)聚在两棵大树下面。
3.你吟诵这一首首小诗,要邀我与你唱和(hãhâhuî)吗?4.当我们一行(xíng háng )中的一位年轻女同志从树下经过时,一只小猴子竟恶(ěâwù)作剧地撒(sāsǎ)起尿来。
5.我脚下长出的根须,深深扎(zāzhā)进泥土和岩层。
6.山路还有更巧妙的办法,它在河床上垫一排大卵石,从水底下一个猛子扎(zāzhā)过去。
四、句子加工厂。
(6分)(1)无数轻捷柔软的手指,弹奏出一首又一首优雅的小曲。
(缩写句字)(2)这山中的一切,哪个不是我的朋友。
(改成陈述句)(3)雨改变了山林的颜色。
改成“被”字句:改成“把”字句:(4)老桥,你如一位德高望重的老人。
(改成感叹句)(5)踏上一条幽径,我独自一个人单独去访问我的朋友。
(修改病句)五、照样子,根据拼音写出不同的词语,再分别造句。
(4分)例:yōu jìng(幽静)这片竹林里很少有人来,十分幽静。
(幽径)我带着满怀的好心情,踏一条幽径,独自去访问我的朋友。
1.qīng jiã()()2.qīng cuì()()六、根据课文原文填空。
《高级英语》张汉熙版 第一册期末试卷及答案

《高级英语》第一册期末试卷TERMINAL EXAMINATIONⅠ. I. Word explanation1. merchant dA. mercenaryB. mechanicC. goodsD. trader2. balance cA. equalityB. quantityC. parallelD. blandness3. peril bA. perimeterB. hazardC. panoramaD. Paralysis4. bloc aA. leagueB. lumpC. restrictionD. square5. carveA. cavernB. tavernC. engraveD. intersect6. undercutA. underchargeB. underpriceC. undersellD. all the above7. grantA. certaintyB. presentationC. subsidiaryD. scholarship8. concessionA. assentB. constrictionC. assertionD. confession9. sophisticatedA. delicateB. intricateC. dandifiedD. dignified10. killingA. easy preyB. big sacrificeC. large profitD. ruthless slaughter11. charterA. mapB. authorizationC. hiringD. b and c12. mothA. home remedyB. buggyC. fly-like animalD. chemical13. bulkA. massB. trunkC. clumsinessD. loose14. doldrumsA. parts of the oceanB. state of being uncertainC. areas near the North PoleD. highly risky situation15. tacticA. tackleB. expedientC. strategyD. policy16. ratifyA. validateB. verdictC. verbosityD. vacillate17. lineA. trainB. shipC. companyD. plane18. dodgyA. docileB. chancyC. doggedD. dogmatic19. suppleA. rich coloursB. flexibleC. purpleD. support20. prefaceA. surfaceB. surface anticipationC. frontD. introduction21. deferentialA. respectfulB. scornfulC. differentialD. indifferent22. adolescentA. adultB. chapC. folkD. juvenile23. despiseA. dislikeB. dismissC. depressD. defer24. disperseA. discreetB. dispatchC. disappearD. scatter25. aridA. wetB. barrenC. fertileD. abandoned26. gluttonA. excessiveB. admirableC. greedyD. glorious27. austereA. seriousB. agonyC. dignifiedD. straight28. intermittentA. internalB. interminableC. constantD. occasional29. nurtureA. concernB. cultivateC. plantD. gather30. divertA. attractB. changeC. entertainD. b and c31. exhilarateA. exciteB. resentC. challengeD. provoke32. cramA. packB. emptyC. crashD. collapse33. maliceA. good desireB. loyaltyC. ill willD. ill treatment34. dismissiveA. emptyB. contemptuousC. longingD. rebellious35. bluffA. breathB. riverC. obstacleD. cliff36. reefA. foregroundB. ridge of rockC. small hillD. high wave37. beaconA. fireB. rock on the beachC. platformD. food38. recessA. cornerB. vacationC. alcoveD. all the above39. loreA. choreB. affectionC. knowledgeD. demand40. appropriateA. possessB. suitablyC. enjoyableD. admirableⅡ. Give the full words according to the contexts and the first letters given:1. If you r an action, event, or decision, you regret it because it has unpleasant result.2. A n is a country’s military force that fights at sea. This word is also used to ref er to the ships and equipment it uses3. If you g something, you take it or pick it up suddenly and roughly.4. A f is a group of ships organized to do something together, for example, to fight battles or to catch fish.5. Something that is p lasts for ever or for a very long time.6. If an account or a person, organization, country etc is in d , money is owed because they have spent more than they have received.7. An e is the part of a person’s arm where the upper and lower halves of the arm are joined.8. If something that you value such as your money or your reputation is at s , it is being risked and is in danger of being lost or damaged, depending on the result of something that is happening.9. To l a rocket, missile, or satellite means to send it into the air or into space.10. A b_ is a fast increase or development in something, often in the popularity or success of something, especially one that results in a lot of money being made.11. The p of a process of development or of an activity is the point or stage at which it is at its strongest, most fully developed, most successful, etc.:12. If you throw in the t_________, or chuck in the t________, you stop trying to do something because you realize that you cannot succeed.13. R is the money that a company or organization receives over a fixed period of time or the money that a government received through taxation.14. If you c someone, you take them prisoner, especially in a war or after a struggle.15. A l_ is a narrow road, especially in the country.16. If you refer to r things or places, you mean that they belong or relate separately to the people you have just mentioned.Ⅲ. Replace the underlined part with one word learnt in the text. The first letter of the word is given:1. Despite his repeated petitions, no one attempted to say a word of objection, haunted by the thought that he might not mean what he says.2. It pained him to see Thomas wandering lazily along the street.3. He told them that he had a terrible piece of news to tell .4. She looked at the whole world with a detachment and atranquillitythat few people have.5. Man is controlled byhis natural tendenciesas well as by reason.6. He thinks that poverty is a punishment of laziness .7. Everybody has his odd and unusual habits , and I am no exception.8. She took the remark as a praise to her cooking.9. We passed the time by telling jokes during the journey.10. To him this is the only place for off-dutyrecreation .Ⅳ. There are 22 words and expressions given below. You are to use their proper forms to finish the sentences. Each word or expression is to be used only once.--------------------------------------------------------------------------------bend on,cash in on,cram,dignify,diversify, dominate,have an eye for,hold on to,inroads,into the bargain,justify,lay down,pinch,relieve,run, save,score off,something of,as far as,take to,to the exclusion of,with a vengeance,--------------------------------------------------------------------------------1. Those people are evidently mischief.2. She completely her family and makes all the decisions.3. Let’s the fine weather and go out for the day.4. They the violence by calling it a patriotic demonstration.5. He the child's cheek playfully.6. The conductor worked on the from Boston to New York.7. Computers will make significant into these areas.8. The soldier found himself a hero when he returned to his village.9. my hand tightly while we cross this street.10. Follow the procedure in our booklet.11. The end the means.12. That factory is trying to its products to sell in different markets.13. He colour and style in clothes.14. Since when __ we __ stamp collecting?15. The heat failed, and then the roof began to leak16. His humorous remark the tension in the room.17. If he had wanted Robert, there were so many better ways than this18. It's no use your head with a lot of unrelated facts; what you need is a system.19. I agree with you, that you have got one or two facts wrong.20. He studied history in the university, all other subjects.21. Your conduct, I can see, is absolutely unjustifiable.22. If the plans for the redevelopment scheme are approved, they'll start knocking houses down .Ⅴ. Cloze--------------------------------------------------------------------------------against, being, brought, fact, final, further, in, legally, less, meet, otherwise, protest, tell, them, Therefore, trouble, which, whatever, without, with--------------------------------------------------------------------------------6021 Gower St. Los AngelesCA 09968October 5, 1988Social Security AdministrationDepartment of Health, Education, and WelfareWashing, D.C. O 20291Dear Sirs;I am writing to your office to attempt to determine why I have encountered so many obstacles to receiving my proper monthly social security allotment. The started ten months ago and has actually gotten worse, making it extremely difficult for me to normal financial obligations.The first problem which I had to deal was simply getting a monthly check from you, having to waiting four or five extra weeks giving me fifty dollars than I should have received. Another check was mailed to me at an address from I moved more than two years ago. My letter of inquiry, which I sent to the Los Angeles office of the Social Security Administration, never an answer, and when I finally telephoned I was able to talk only with an arrogant clerk from the tone of whose voice I could that he didn't want to be bothered with me. The blow is a letter received from your office just yesterday which you state that my allotment is discontinued, your records indicating that I am dead.Beyond this letter of I have at least one other recourse: filing suit the Social Security Administration, which I would prefer not to have to do. I am asking you to please take steps are necessary to ensure that from now on I receive my social security benefits without obstacles. This letter is mute testimony to the that I am indeed not dead, legally or .Thelma SpencerYours sincerelyⅥ. Reading Comprehension.ATimes Square is like Piccadilly Circus in London. People walk quickly, their faces down, their brows furrowed. This is the center of life for many New Yorkers and for many visitors who see it for the first time. It can be compared to the heart of the beast. It is vital and throbbing with throngs of workers, students, and pleasure-seekers. Noises abound on all sides, first a taxi honks, then a bus, then a policeman blows his whistle and shouts to the crowds dashing across the street. In the distance, church bells toll. Beneath their feet, the rumble of the subway can be heard while the subterranean steam rises from the gratings in the sidewalk to meet the cold air on the street.1. According to the story, Times Square is __.A. not uniqueB. desertedC. too coldD. in London2. The throbbing of Times Square is caused by __.A. the subway scheduleB. the beasts who are thereC. the movements of the crowdsD. the circus3. Which of the noise does one not hear in Times Square?A. Church bellsB. Taxi hornsC. The wind whistling in the treesD. Shouts from policemen4. The steam mentioned in the story comes from __.A. undergroundB. the busesC. the carsD. the ships5. The weather in Times Square at that time was __.A. hotB. windyC. coldD. snowy6. How would you describe the faces of the people?A. SmilingB. Brows furrowedC. Faces upliftedD. CuriousBThe people archaeology concerns itself with are no longer alive. So the archaeologist finds ways to “communicate” with them by studying the things that they left behind, which are called artifacts. Deciding what to look for, where to look, and how to evaluate what is found are all matters that archaeologist must consider --- often even before any digging is done. When the digging, or excavation, does finally begin, the archaeologist needs great patience, skill, and training to be sure nothing is overlooked or destroyed. Drawings and careful notes are made of every stage of the excavation. Only after each find has been recorded in image and word can the artifacts be removed from the site. For the truth is that archaeology does not consist of fieldwork alone. It is in the laboratory that most discoveries about past cultures are actually made.1. With which of the following topics is the passage mainly concerned?A. Archaeologists who are no long alive.B. Artists and archaeologists.C. Laboratory discoveries in archaeology.D. The working methods of archaeologists2. In line 2, the author uses the expression “communicate” to i mply that archaeologist __.A. share news with other scientistsB. receive information about people of the pastC. study the dialects spoken by ancient peopleD. leave their discussions for a later time3. Which of the following is NOT mentioned by the author as a matter archaeologists must consider?A. The way in which evaluations are carried outB. Where artifacts might be found.C. How artifacts can be reproduced.D. What objects should be searched for.4. The word “drawings” in line 8 is closest in meaning to which of the following?A. DescriptionsB. SchedulesC. PhotographsD. Sketches5. According to the passage, archaeologists derive the most knowledgeabout previous civilizations from __?A. laboratory analysis of the artifacts they findB. discussions with their colleagues out at the siteC. observation of the work carried out at the siteD. notes they make during the excavationⅦ. Paraphrase:1. Russia has expanded its cargo-liner fleet far faster than the growth in either its own trade or world trade would justify.2. They make it harder to make a big killing in good times.3. The Colonel, who is not too offensively an Empire-builder, sometimes tries to talk to me about public affairs.4. I want my fill of beauty before I go.答案1-1: /答案:D1-2: /答案:A1-3: /答案:B1-4: /答案:A1-6: /答案:D 1-7: /答案:D 1-8: /答案:A 1-9: /答案:B 1-10: /答案:C 1-11: /答案:D 1-12: /答案:C 1-13: /答案:A 1-14: /答案:A 1-15: /答案:B 1-16: /答案:A 1-17: /答案:C 1-18: /答案:B 1-19: /答案:B 1-20: /答案:D 1-21: /答案:A 1-22: /答案:D 1-23: /答案:A 1-24: /答案:D 1-25: /答案:B 1-26: /答案:C 1-27: /答案:A 1-28: /答案:D 1-29: /答案:B 1-30: /答案:D 1-31: /答案:A 1-32: /答案:A 1-33: /答案:C 1-34: /答案:B 1-35: /答案:D 1-36: /答案:B 1-37: /答案:A 1-38: /答案:D 1-39: /答案:C 1-40: /答案:B 6-A-1: /答案:A 6-A-2: /答案:C 6-A-3: /答案:C 6-A-4: /答案:A 6-A-5: /答案:C 6-A-6: /答案:B 6-B-1: /答案:D 6-B-2: /答案:B6-B-4: /答案:D 6-B-5: /答案:A 2-1: /答案: rue2-2: /答案:navy2-3: /答案:grab2-4: /答案:fleet2-5: /答案:permanent2-6: /答案:deficit2-7: /答案:elbow2-8: /答案:stake2-9: /答案:launch2-10: /答案:boom2-11: /答案:peak2-12: /答案:towel2-13: /答案:revenue2-14: /答案:capture2-15: /答案:lane2-16: /答案:respective.3-1: /答案:ventured3-2: /答案:lounging3-3: /答案:impart3-4: /答案:serenity3-5: /3-6: /答案:indolence3-7: /答案:quirks3-8: /答案: compliment3-9: /答案:beguile3-10: /答案:relaxation4-1: /答案: bent on4-2: /答案:dominates4-3: /答案:cash in on4-4: /答案:dignified4-5: /答案:pinched4-6: /答案:run4-7: /答案:inroads4-8: /答案:something of4-9: /答案:hold on to4-10: /答案:laid down4-11: /答案:justifies4-12: /答案:diversify4-13: /答案:has an eye for 4-14: /答案:did...take to4-15: /答案:into the bargain 4-16: /答案:relieved4-17: /4-18: /答案:cramming4-19: /答案:save4-20: /答案:to the exclusion 4-21: /答案:as far as4-22: /答案:with a vengeance 5-1: /答案:trouble5-2: /答案:meet5-3: /答案:with5-4: /答案:without5-5: /答案:less5-6: /答案:which5-7: /答案:brought5-8: /答案:them5-9: /答案:tell5-10: /答案:final5-11: /答案:in5-12: /答案:being5-13: /答案:legally5-14: /答案:protest5-15: /答案:against5-16: /答案:Therefore5-17: /5-18: /答案:further5-19: /答案:fact5-20: /答案:otherwise。
《英语(一)》期末考试试卷【 A卷】和答案

1《英语(一)》期末考试试卷【A卷】(学年第一学期)注意:1.本试卷共 3 页;2.考试时间: 90 分钟Section A (1×15=15分)Directions: Choose the appropriate letters A—D to complete the following statements.1. I knew a new classmate Ann today. She is _______ America.A. forB. inC. toD. from2. All of his friends came to the airport to______ him____ .A. send…downB. see…offC. send…downD. se e…awa y3. It is of _______for us to get everything read before the party.A. greatly importantB. great importantC. great importanceD. greatly importance4. S1: Can you spare some time for me next week?S2: ______________.A. I’m really very busy now.B. OK. What can I do for you?C. I usually go out seeing movies in my spare time.D. My family will go traveling this evening.5. Would you _____to join us for dessert and coffee?A mind B. please C. like D. care6. I would___ for daily necessities tomorrow. Will you go with me?A. go to shopB. make shoppingC. go shoppingD. buy7. Chinese people have a special way to celebrate the Mid-autumn _______. .A. HolidayB. VacationC. EventD. Festival8. Jack is _______ about stamp collecting. In fact, he is willing to give everything for a rare stamp.A. interestedB. illC. crazyD. sick9. Two hundred people are expected to _______ the meeting.A. attendB. haveC. takeD. go10. Please us at campuslife@ if you need detailed information.A. touchB. contactC. searchD. tell11. Will it be _________ for you to start work tomorrow.A. convenientB. convenienceC. convenientlyD. conveniences12. It is overclouding in the sky and it _____like rain.A. isB. seemsC. seemD. be13. Passengers to pay duty on overweighed luggage.A. requireB. requiredC. are requiredD. were required14. Supermarkets usually provide a(n) Lane for customers with a purchase less than 8 items.A. ExpressB. Hurry-upC. Speed-upD. Fast15. It is difficult for me to __________ the twins ________.A. tel l…fromB. tel l…apartC. tel l…betweenD. tel l…amongSection B (1×10=10分)Directions: Complete each statement with the proper form of the word given in the brackets.16. Jackie Chan is admired by millions as an excellent (act).17. He was about the same (high) as his wife.18. there are as many as 30 different (nation) in this school.19. Tom falls in love with the most (attract) girl in his class.20. Our house was built in a (tradition) Chinese style.21. Many animals have (good) hearing than we do.22. Coin (collect) is one of Jim’s hobbies.23. Sam used to (keep) a pet ,when he was young.24. It’s my pleasure to (introduction) tonight’s speakers.25. He is a very (talk ) child.Part II Reading ComprehensionTask1 (2×5=10分)Directions: Read the passage and choose the appropriate letters A—D to answer each question.Perhaps the best way to think about making friends is to decide what makes a friend. I asked a group of 13 year old boys and girls to come up with a list of what they liked about their friends. They said that good friends: show an interest in what people dogo around with a pleasant expression on their facelaugh at people’s jokesare kindoffer to help others with work or carry thingsinvite people to do somethingare good at thinking of something interesting to doare willing to shareare humorous and tell jokesare fair26. According to the author, what is the best way to make friends?A) The best way is to talk to everyone.B) The best way is to do everything to make the person happy.C) The best way is to think everyone is good.D) The best way is to know what a good friend is.27. How did the author get the list?A) He thought it out.B) He copied it from a book.C) He summed up the ideas of a group of children.D) He made friends with a group of children.28. How many good qualities should a good friend have?A) 6. B) 7. C) 9. D) 10.29. Which of the following is NOT true?A) A good friend should have a sense of humor.B) A good friend should be able to tell jokes and enjoy others’ jokes.C) A good friend should always keep from getting into groups.D) A good friend should enjoy sharing things with others.30. Which of the following is the best title for this passage?A) What Makes a Good FriendB) The Best Way to Make FriendsC) The Results of a SurveyD) How to Make FriendsTask 2 (2×5=10分)Directions: Read the passage and choose the appropriate letters A—D to answer each question.Banks safeguard money and valuables and provide loans, credit, and payment services, such as checking accounts, money orders, and cashier’s checks. Banks may also offer investment and insurance products, which they were once prohibited from selling.As many models for cooperation and integration among finance industries have appeared, some of the traditional differences between banks, insurance companies, and securities firms have disappeared. In spite of these changes, banks continue to maintain and perform their primary role—accepting deposits and lending funds from these deposits.Commercial banks, which dominate the bank industry, offer a full range of services for individuals, businesses, and governments.31. What is the first paragraph mainly about?A. It introduces the types of banks.B. It introduces the functions of banks.C. It explains the traditional functions of banks.D. It discusses the business of banks.32. What are the traditional functions of a bank?A. It safeguards money and valuables.B. It provides loans, credit, and payment services.C. It safeguards money and valuables and provides loans, credit, and payment services.D. It sells investment and insurance products.33. Which of the following statements is not true?A. Banks also play the role of insurance companies.B. Banks safeguard money and valuables like securities firms do.C. Insurance companies cannot play the role of banks.D. The primary functions of banks will always be there. 34. What is the basic role of banks?A. Accept customer’s deposits.B. Back individuals or firms by lending funds.C. Provide firms with investments.D. Accept customer’s deposits and invest the deposits as funds.35. Which of the following is the best title for this passage?A. Nature of Bank IndustryB. Types of BanksC. Changes in Bank IndustryD. Functions of BanksTask 3 (1×5=5分)Directions: Read an ad. Fill in the blanks with Not More Than 3 words in the table below.Shaw’s SupermarketEarn up to $100 from your Shaw’s Osco Pharmacy.Click here for more information.Click here for new dinner ideas from Shaw’s and Swift Premium.Fresh Meal Solutions for Your Family!Click here for detailsAt Shaw’s, we offer you all the attention you could ever want, both online and in your neighborhood store.From pharmacy prescriptions to our in-store CoinStar service. From photo processing to great gift ideas like Gift Cards, prepaid calling cards and cellular programs. From Shaw’s.Task 4 (1×10=10分)Directions: Choose the appropriate letters A—Q to translate the Chinese expressions in the table. A………………………………………………golf course B………………………………………………swimming pool C………………………………………………invitation D…………………………………………credit card E………………………………………………online bank F………………………………………………a deposit form G………………………………………………get-together H………………………………………………going-away party I………………………………………………..family album23J ………………………………………………..instant message service K ………………………………………………withdraw L ………………………………………………check-out desk M ………………………………………………post card N ………………………………………………cashO ………………………………………………international campus P ………………………………………………celebration Q ………………………………………………great grandparentsTask 5 (1×5=5分)Directions: Read the invitation card and answer the questions.46. Whose birthday is it?It is . 47. How old is she going to be?She is going to be . 48. When is her birthday?It ’s on . 49. Where is the party going to be ?I t’s going to be held at . 50. What kind of card is it?It is .Part III TranslationDirections: Each of the four sentences (NO. 51 to NO. 54) is followed by four choices of suggested translationmarked A, B, C and D. Make the best choice and put the paragraph (No.65) into Chinese. (51-54:3×4=12分; 55: 8×1=12分)51. Chess must be one of the oldest games in the world. A. 象棋必须是世界上最古老的游戏之一。
物理化学下册期末复习试卷1题目
物理化学复习题一[一]单选择题(1) 导体可分为两类,第一类是电子导体,第二类是离子导体。
当温度升高时,其导电能力(a )第一类导体增大,第二类导体也增大(b )第一类导体降低,第二类导体也降低 (c )第一类导体增大,第二类导体降低(d )第一类导体降低,第二类导体升高(2) 某溶液的浓度为 c (mol dm -3)电导率为κ(S m-1),则摩尔电导率Λm (用 SI 单位)与 c 和 κ 的关系为:(a )Λm =κ⨯103/c (b )Λm =κ⨯10-3/c(c )Λm =κ/c (d )Λm =κ⨯10-6/c (3) 下述各量与电池反应方程式的书写无关的是:(a )Q R ; (b )r m H ∆(c )K ; (d )E(4) 某温度下,电池 Na(Hg)(a 1)|NaCl(aq)|Na(Hg)(a 2)的电动势E <0,则a 1和a 2的关系为:(a )a 1>a 2 (b )a 1<a 2 (c )a 1=a 2 (d )难以确定 (5) 实际电解时,在阳极上首先发生氧化作用而放电的是:(a )标准电极电势最正者(b )标准电极电势最负者(c )考虑极化后的不可逆电势最高者 (d )考虑极化后的不可逆电势最低者(6)用同一电导池分别测定浓度为 0.01 mol dm -3KCl 与1 mol dm -3 的 AgNO 3电解质溶液,其电导分别为 1.0⨯10-4及 1.0⨯10-3S, 则二溶液的摩尔电导率的比是:(a )10:1 (b )5:1(c )20:1 (d )1:1(7) 浓度为m 的Al 2(SO 4)3溶液中,正负离子的活度系数分别为γ+ 和 γ-,则平均活度系数γ±等于: (a )(108)1/5m (b )(γ+2γ-3)1/5m (c )(γ+2γ-3)1/5(d )(γ+3γ-2)1/5(8)下列可逆电极中,对OH –不可逆的是:(a )Pt | H 2(g)|OH - (b )Pt | O 2(g)|OH –(c )Hg(l)|HgO(s)|OH - (d )Ba(s)|BaSO 4(s)|OH - (9)电池短路时:(a )电池的电动势趋于零(b )电池所做电功要小于可逆放电时的功(规定体系对环境做功为负值) (c )这时反应的热效应Q p = ∆r H m (d )瞬间可作极大电功(10)对于甘汞电极,下列叙述正确的是:(a )电极反应为 Hg 22++2e →Hg ;(b )属于第一类电极;(c )对阴离子可逆,电极电势较稳定;(d )电极电势为E (Hg 2Cl 2)=E (Hg 2Cl 2)+(RT /2F )ln a (Cl -)(11) 电池 Pt |A |A -(a 1)‖A -(a 2)|A |Pt 当电池电动势E >0,则:(a) a 1>a 2 (b) a 1<a 2(c) a 1=a 2 (d) a 1/a 2任意比值都可(12) 电池 Ag(s) | AgNO 3(,1γ±,m 1) || AgNO 3(,2γ±,m 2) | Ag(s) 的电动势E 应为:(a) -(2 RT /F )ln(,1γ±m 1/,2γ±m 2) (b) -(2 RT /F )ln(,2γ±m 2/,1γ±m 1) (c) -(RT /F )ln(,1γ±m 1/,2γ±m 2) (d) -(RT /F )ln(,2γ±m 2/,1γ±m 1) (13)将反应 H ++OH -=H 2O 设计成可逆电池,选出下列电池中正确的一个:(a )Pt │H 2│H +(aq)‖OH -│O 2│Pt (b )Pt │H 2│NaOH(aq)│O 2│Pt(c )Pt │H 2│NaOH(aq)‖HCl(aq)│H 2│Pt (d )Pt │H 2 (P 1)│H 2O(l)│H 2 (P 2)│Pt(17) 相同温度下,液体水、金属银和液体苯三种物质中表面张力最小的是_______。
职业教育精品课程《网络营销实务》期末考试试卷1及答案
一、选择题。
(共30分)1.网络营销策划应遵循的相关原则有系统性原则、可操作性原则、经济性原则,以及(B )原则。
A.实践性B. 创新性C. 客观性D. 可控制性2.市场营销信息是指在一定时间和条件下,与企业的市场营销活动相关的各种消息、情报、资料与(A )的总称。
A.知识B. 文献C. 图表D. 数据3.微博是一个基于用户关系,通过关注机制分享简短实时信息的广播式的社交网络平台,一般以( D )字左右的文字更新信息,并实现即时分享。
A.150B. 140C. 160D. 1204.我们当今的网络时代,网络信息的收集绝大部分是通过(C )获得的。
A.聊天程序B. 新闻组C. 搜索引擎D. BBS5.网络商务信息可以方便地从网上下载到自己的计算机上管理,在原有地各个网站上也有信息存储系统,可以到原有地信息源中再次查找。
说明网络商务信息的(C )。
A.时效性强B. 准确性高C. 便于存储D. 方便性6.由于网络信息更新及时、传递速度快,只要信息收集者及时发现信息,就可以保证信息的( A )。
A.时效性强B. 准确性高C. 便于存储D. 方便性7.网络信息的收集,绝大部分是通过搜索引擎找到信息发布源获得的,减少了信息传递的中的中间环节,有效地保证了信息的(B )。
A.时效性强B. 准确性高C. 便于存储D. 方便性8.关于电子商务信息的传递以下正确的是(B )。
A.电子商务信息,由于传递速度慢、传递渠道不畅,经常导致“信息获得了但也失效了B.由于网络信息更新及时、传递速度快、只要信息收集者及时发现信息,就可以保证信息的实效性C.无论怎么样,网络信息都是最快最准确的D.电子商务信息,都是很迟后的9.生产观念的实质是(C )。
A.以销售为经营活动的中心B. 以产品为中心C. 生产为中心D. 以市场需求为中心10. Email营销与垃圾邮件的本质区别是(B )。
A. 邮件是否有用B. 是否实现获得用户许可C. 邮件是否合法D. 邮件是否有病毒11. 市场观念的中心是(D )。
高等数学1期末试卷(5套)
试卷(一)一、1、下列等式中成立的是( B ).(A) e n nn =⎪⎭⎫⎝⎛+∞→21lim (B) e n n n =⎪⎭⎫ ⎝⎛++∞→211lim (C) e n nn =⎪⎭⎫ ⎝⎛+∞→211lim (D) e n nn =⎪⎭⎫⎝⎛+∞→211lim2、函数()x f 在点0x 处连续是在该点处可导的( ).(A) 必要但不充分条件 (B) 充分但不必要条件 (C)充分必要条件 (D) 既非充分也非必要条件 3、设函数()x f 可导,并且下列极限均存在,则下列等式不成立的是( ).(A) ()()()00limf x f x f x '=-→ (B) ()()()0000lim x f x x x f x f x '=∆∆--→∆(C) ()()()a f h a f h a f h '=-+→2lim(D) ()()()00002lim x f xx x f x x f x '=∆∆--∆+→∆ 4、若(),00='x f 则点0x x =是函数()x f 的( ).(A) 极大值点 (B) .最大值点 (C) 极小值点 (D) 驻点5、曲线12+=x x y 的铅直渐近线是( ).(A )y =1 (B )y =0 (C )1-=x (D )x =0 6、设xe-是)(x f 的一个原函数,则⎰=dx x xf )(( ).(A )c x e x+--)1( (B )c x e x++-)1( (C )c x e x+--)1( (D ) c x e x++--)1( 二、1、当0x →时,(1cos )x -与2sin2xa 是等价无穷小,则常数a 应等于______ _. 2、若82lim =⎪⎭⎫⎝⎛-+∞→xx b x b x ,则=b .3、函数123++=x x y 的拐点是 .4、函数()x y y =是由方程y x y +=tan 给出,则='y ______________________.5、双曲线1xy =在点()1,1处的曲率为 .6、已知)(x f 在),(∞+-∞上连续,且2)0(=f ,且设2sin ()()x xF x f t dt =⎰,则(0)F '= .三、 1、求极限()xx x x x sin tan cos 1lim20-→ .2、设曲线的方程为33190x y (x )cos(y ),π++++=求此曲线在1x =-处的切线方程.3、求不定积分⎰++322x x xdx.4、求不定积分dx x x ⎰+31. 5、求定积分dx x x ⎰22cos π.6、求定积分⎰--+11242dx xx .四、1、求抛物线12+=x y 与直线1-=x y 所围成的图形. 2、设()f x ''连续,()1f π=,()()0sin 3f x f x xdx π''+=⎡⎤⎣⎦⎰,求()0f .试卷(二)一、1、=+→xx x 2)31(lim .2、当=k 时,⎪⎩⎪⎨⎧>+≤=00e)(2x kx x x f x 在0=x 处连续.3、设x x y ln +=,则=dydx. 4、曲线x e y x -=在点)1,0(处的切线方程是 .5、设两辆汽车从静止开始沿直线路径前进,下图中给出的两条曲线)(1t a a =和)(2t a a =分别是两车的速度曲线.那么位于这两条曲线和直线T t = )0(>T 之间的图形的面积A 所表示的物理意义是 .二、1、若函数xx x f =)(,则=→)(lim 0x f x ( ).A 、0B 、1-C 、1D 、不存在 2、下列变量中,是无穷小量的为( ).A 、 x 1ln(当+→0x ) B 、x ln (当1→x ) C 、x cos (当0→x ) D 、 422--x x (当2→x ) 3、满足关系式0)(='x f 的x 是函数)(x f y =的( ).A 、极大值点B 、极小值点C 、驻点D 、间断点 4、下列函数)(x f 在]1,1[-上适合罗尔中值定理条件的是( ).A 、32)(x x f =B 、x x x f 2)(=C 、32)(+=x x fD 、x x f sin )(= 5、下列无穷积分收敛的是( ).A 、⎰∞+ 0sin xdx B 、dx x ⎰∞+ 01C 、dx e x ⎰∞+- 0 2D 、dx x⎰∞+ 0 1三、1、求极限 xx x 2sin 24lim-+→ . 2、求极限 2cos 2cos 0lim x dte xx t x ⎰-→.3、设)1ln(25x x e y +++=,求y '.4、设)(x y f =由已知⎩⎨⎧=+=ty t x arctan )1ln(2,求22dx y d . 5、求不定积分dx xx x ⎰+)sin (ln 2.6、设⎪⎩⎪⎨⎧≥<+=-0011)(2x xe x x x f x , 求⎰-20d )1(x x f .四、1、设函数21)(xxx f +=,分别求其单调区间、极值、凹凸性与拐点. 2、设)(x f 在闭区间],[b a 上连续,在开区间),(b a 内可导)0(>a .试证在),(b a 内至少存在一点ξ满足:)(][)]()([2012201220122011ξξf a b a f b f '-=-.试卷(三)一、1.设)sin (cos )(x x x x f +=,则在0=x 处有( ).(A)2)0(='f (B) 1)0(='f (C) 0)0(='f (D) )(x f 不可导 2.设333)(,11)(x x xxx ⋅-=+-=βα,则当1→x 时( ). (A) )(x α与)(x β是同阶无穷小,但不是等价无穷小; (B) )(x α与)(x β是等价无穷小; (C) )(x α是比)(x β高阶的无穷小; (D) )(x β是比)(x α高阶的无穷小.3.函数2)4(121++=x xy 的图形( ). (A) 只有水平渐近线; (B) 有一条水平渐近线和一条铅直渐近线; (C) 只有铅直渐近线; (D) 无渐近线.4.设函数nn x xx f 211lim)(++=∞→,则下列结论正确的为( ).(A) 不存在间断点; (B) 存在间断点1=x ; (C) 存在间断点0=x ; (D) 存在间断点1-=x .5.设函数)(x f 是连续函数,且⎰+=1)(2)(dt t f x x f ,则)(x f = ( ).(A) 22x (B)222+x (C) 1-x (D) 2+x 6.广义积分)0( >⎰∞+a xdxap 当( )时收敛. (A) 1>p (B) 1<p (C) 1≥p (D) 1≤p二、1.=+→xx x sin 20)31(lim .2.曲线⎩⎨⎧=+=321ty t x 在t=2处的切线方程为 . 3.方程0162=-++x xy e y 确定隐函数)(x y y =,则)0(y '= .4.⎰--+2121 2211arcsin dx xx x = .5.已知x x cos 是)(x f 的一个原函数,则dx xxx f ⎰cos )(= . 6.=⎰→22 0sin lim2xtdt e xt x .三、1.(6分)已知tt t x x f ⎪⎪⎭⎫⎝⎛+=+∞→2sin 1lim )(,求)(x f '. 2.(6分)求不定积分dx xx⎰++cos 1sin 1. 3.(8分)设函数⎩⎨⎧≤<-≤=-1010)(2x x x xe x f x ,,,求dx x f ⎰-1 3 )(. 4.(8分)已知2)3(lim 2=++-∞→c bx ax x x ,求常数b a ,.5.(8分)求由曲线)1(2,4,22≥===x x y x y xy 所围图形的面积.6.(8分)由方程)ln(arctan22y x x y +=确定隐函数)(x f y =,求0=y dx dy . 7.(8分)设函数)(x f 在[0,1]上连续且单调递减,证明:对任意的],1,0[∈q ⎰⎰≥qdx x f q dx x f 01)()(.试卷(四)一、1.方程23cos2x y y y e x '''--=的特解形式为( )(A )cos 2xaxe x ; (B )cos 2sin 2xxaxe x bxe x +; (C )cos 2sin 2xxae x be x +; (D )22cos 2sin 2xxax e x bx e x +.2. 设a 不是π的整数倍,极限ax a x a x -→⎪⎭⎫⎝⎛1sin sin lim 的值是( ).(A ) 1 (B )e (C )a e cot (D )ae tan3. 函数⎪⎩⎪⎨⎧=≠-+=0 ,0 ,1sin )(2x a x xe x xf ax 在0=x 处连续,则=a ( ). (A )1 (B ) 0 (C )e (D )1-4. 设2()()lim1()x af x f a x a →-=--,则在x a =处有( ) (A )()f x 的导数存在,且()0f a '≠; (B )()f x 取得极大值; (C )()f x 取得极小值; (D )()f x 取得最大值.5. 设函数)(x f 在点0=x 的某个邻域内连续,且0)0(=f ,2cos 1)(lim0=-→xx f x ,则点0=x ( ).(A )是)(x f 的极大值点(B )是)(x f 的极小值点(C)不是)(x f 的驻点(D )是)(x f 的驻点但不是极值点二、1. 设tan 21, 0sin 2(), 0xx e x x f x ae x ⎧->⎪⎪=⎨⎪⎪≤⎩在0x =连续,则a =____________.2. 极限xaa x x ln )ln(lim0-+→(0>a )的值是 .3. 设()(1)(2)(99)f x x x x x =---L ,则(0)f '=____________.4. 曲线21x xe y =的铅直渐近线是 . 5. 函数)4ln(x x y -=的单调递增区间为 .三、1. 计算极限412921612lim 2332-+-+-→x x x x x x . 2. 求不定积分10arctan d x x x ⎰. 3. 求定积分⎰+41)1(x x dx . 4. 求函数122+=x xy 的极值与拐点.5. 求微分方程52d 2(1)d 1y y x x x -=++的通解. 6. 设1>a ,函数a a x x a x a x y +++=,求dxdy . 四、证明题(本题8分)证明:当02x <<时,有24ln 240x x x x --+>.试卷(五)一、 1. 下列各式正确的是( ).(A)1)11(lim 0=++→x x x (B) e x x x =++→)11(lim 0(C) e x x x -=-∞→)11(lim (D)e xxx =+-∞→)11(lim 2. 设()f x 可导,()()(1sin )F x f x x =+,若欲使()0F x x =在可导,则必有 ( ).(A )(0)0f '=(B )(0)0f = (C )(0)(0)0f f '+=(D )(0)(0)0f f '-=3.为,则 又设已知 )()20( d )()(21 110 )(12x F x t t f x F x x x x f x ⎰≤≤=⎩⎨⎧≤≤<≤=( ).⎪⎩⎪⎨⎧≤≤<≤21 10 31)(3x x x x A ⎪⎩⎪⎨⎧≤≤<≤-21 10 3131)(3x x x x B ⎪⎩⎪⎨⎧≤≤-<≤21 110 31)(3x x x x C ⎪⎩⎪⎨⎧≤≤-<≤-21 1103131)(3x x x x D 4.当0→x 时,与x ex cos 22-等价的无穷小是( ).(A )2x . (B )223x . (C )22x . (D )225x . 5.x e y y y x2cos 52=+'-''的一个特解应具有形式( ).(A )x Ae x2cos (B ))2sin 2cos (x B x A e x+(C ))2sin 2cos (x B x A xe x+ (D ))2sin 2cos (2x B x A e x x+ 二、1. 已知2sin ()d x f x x e C =+⎰,则()f x =____________.2.设函数22, 1()ln(1), 1a x x f x x x x ⎧+>-=⎨++≤-⎩在1x =-处连续,则a = . 3. 设),tan ln(sec x x y +=则='y .4. 设()f x 是连续函数,则dt t f a x x xaa x ⎰-→ )(lim= .5. 已知⎰+=C x dx x f arcsin )(,则=-⎰dx x f x )(12. 6. 由0 , 0)( , , =≥===y x f y b x a x 所围曲边梯形绕x 轴旋转而成的旋转体的体积公式为:V = . 则(应用你给的公式计算)由],[,)(22R R x x R x f y -∈-==与x 轴所围成的图形绕x 轴旋转而成的立体的体积=V . 三、1. (6分) 1.求函数22(,)(2)ln f x y x y y y =++的极值.2. (6分)设arctany x= 求dx dy .3.(6分)求微分方程满足初始条件的特解1,sin ==+=πx y xx x y dx dy . 4. (6分) 设由方程2cos()1x y e xy e +-=-确定y 是x 的函数,求d .0d yx x =5. (7分) 求函数22(,)(2)ln f x y x y y y =++的极值. 6 若函数)(x f 在]1,0[上连续,证明:=⎰π)(sin dx x xf ⎰)(sin 2ππdx x f ,并计算dx xxx ⎰+π2cos 1sin . 8. 过原点(0,0)O 作曲线ln y x =的切线,该切线与曲线ln y x =及x 轴围成一平面图形,求此平面图形的面积.《高等数学》试卷6(下)一.选择题(3分⨯10)1.点1M ()1,3,2到点()4,7,22M 的距离=21M M ( ).A.3B.4C.5D.62.向量j i b k j i a+=++-=2,2,则有( ).A.a ∥bB.a ⊥bC.3,π=b aD.4,π=b a3. 设有直线1158:121x y z L --+==-和26:23x y L y z -=⎧⎨+=⎩,则1L 与2L 的夹角为( ) (A )6π; (B )4π; (C )3π; (D )2π. 4.两个向量a 与b垂直的充要条件是( ).A.0=⋅b aB.0 =⨯b aC.0 =-b aD.0 =+b a5.函数xy y x z 333-+=的极小值是( ). A.2 B.2- C.1 D.1-6.设y x z sin =,则⎪⎭⎫ ⎝⎛∂∂4,1πyz =( ).A.22 B.22- C.2 D.2- 7. 级数1(1)(1cos ) (0)nn n αα∞=-->∑是( )(A )发散; (B )条件收敛; (C )绝对收敛; (D )敛散性与α有关.8.幂级数∑∞=1n n n x 的收敛域为( ).A.[]1,1- B ()1,1- C.[)1,1- D.(]1,1-9.幂级数nn x ∑∞=⎪⎭⎫⎝⎛02在收敛域内的和函数是( ).A.x -11 B.x -22 C.x -12 D.x -21 二.填空题(4分⨯5)1.一平面过点()3,0,0A 且垂直于直线AB ,其中点()1,1,2-B ,则此平面方程为______________________.2.函数()xy z sin =的全微分是______________________________.3.设13323+--=xy xy y x z ,则=∂∂∂yx z2_____________________________.4. 设L 为取正向的圆周:221x y +=,则曲线积分2(22)d (4)d Lxy y x xx y -+-=⎰Ñ____________.5. .级数1(2)nn x n ∞=-∑的收敛区间为____________.三.计算题(5分⨯6)1.设v e z usin =,而y x v xy u +==,,求.,yz x z ∂∂∂∂ 2.已知隐函数()y x z z ,=由方程05242222=-+-+-z x z y x 确定,求.,yz x z ∂∂∂∂ 3.计算σd y x D⎰⎰+22sin ,其中22224:ππ≤+≤y x D . 4..计算1d d yxy x x⎰.试卷6参考答案一.选择题 CBCAD ACCBD 二.填空题1.0622=+--z y x .2.()()xdy ydx xy +cos .3.19622--y y x .4.()n n n n x ∑∞=+-0121. 5.()x e x C Cy 221-+= .三.计算题 1.()()[]y x y x y e x z xy +++=∂∂cos sin ,()()[]y x y x x e y z xy +++=∂∂cos sin . 2.12,12+=∂∂+-=∂∂z y y z z x x z . 3.⎰⎰=⋅πππρρρϕ202sin d d 26π-. 4.3316R . 5.x x e e y 23-=. 四.应用题1.长、宽、高均为m 32时,用料最省.2..312x y =《高数》试卷7(下)一.选择题(3分⨯10)1.点()1,3,41M ,()2,1,72M 的距离=21M M ( ). A.12 B.13 C.14 D.152.设两平面方程分别为0122=++-z y x 和05=++-y x ,则两平面的夹角为( ). A.6π B.4π C.3π D.2π 3.点()1,2,1--P 到平面0522=--+z y x 的距离为( ). A.3 B.4 C.5 D.6 4.若几何级数∑∞=0n nar是收敛的,则( ).A.1≤rB. 1≥rC.1<rD.1≤r8.幂级数()nn xn ∑∞=+01的收敛域为( ).A.[]1,1-B.[)1,1-C.(]1,1-D. ()1,1- 9.级数∑∞=14sin n n na是( ). A.条件收敛 B.绝对收敛 C.发散 D.不能确定10. .考虑二元函数(,)f x y 的下列四条性质:(1)(,)f x y 在点00(,)x y 连续; (2)(,),(,)x y f x y f x y 在点00(,)x y 连续 (3)(,)f x y 在点00(,)x y 可微分; (4)0000(,),(,)x y f x y f x y 存在. 若用“P Q ⇒”表示有性质P 推出性质Q ,则有( )(A )(2)(3)(1)⇒⇒; (B )(3)(2)(1)⇒⇒ (C )(3)(4)(1)⇒⇒; (D )(3)(1)(4)⇒⇒ 二.填空题(4分⨯5)1. 级数1(3)nn x n ∞=-∑的收敛区间为____________.2.函数xye z =的全微分为___________________________.3.曲面2242y x z -=在点()4,1,2处的切平面方程为_____________________________________.4.211x +的麦克劳林级数是______________________. 三.计算题(5分⨯6)1.设k j b k j i a32,2+=-+=,求.b a ⨯2.设22uv v u z -=,而y x v y x u sin ,cos ==,求.,y z x z ∂∂∂∂ 3.已知隐函数()y x z z ,=由233=+xyz x 确定,求.,yz x z ∂∂∂∂ 4. 设∑是锥面1)z z =≤≤下侧,计算y z 2d d 3(1)d d xd d y z x z x y ∑++-⎰⎰四.应用题(10分⨯2) 试用二重积分计算由x y x y 2,==和4=x 所围图形的面积.试卷7参考答案一.选择题 CBABA CCDBA. 二.填空题1.211212+=-=-z y x .2.()xdy ydx e xy +.3.488=--z y x .4.()∑∞=-021n n n x . 5.3x y =. 三.计算题1.k j i238+-.2.()()()y y x y y y y x yz y y y y x x z 3333223cos sin cos sin cos sin ,sin cos cos sin +++-=∂∂-=∂∂ .3.22,z xy xz y z z xy yz x z +-=∂∂+-=∂∂. 4. ⎪⎭⎫ ⎝⎛-3223323πa . 5.xx e C e C y --+=221. 四.应用题 1.316. 2. 00221x t v gt x ++-=.《高等数学》试卷3(下)一、选择题(本题共10小题,每题3分,共30分) 1、二阶行列式 2 -3 的值为( )4 5A 、10B 、20C 、24D 、222、设a=i+2j-k,b=2j+3k ,则a 与b 的向量积为( ) A 、i-j+2k B 、8i-j+2k C 、8i-3j+2k D 、8i-3i+k3、点P (-1、-2、1)到平面x+2y-2z-5=0的距离为( ) A 、2 B 、3 C 、4 D 、54、函数z=xsiny 在点(1,4π)处的两个偏导数分别为( ) A 、,22 ,22 B 、,2222- C 、22- 22- D 、22- ,225、设x 2+y 2+z 2=2Rx ,则yzx z ∂∂∂∂,分别为( ) A 、z y z R x --, B 、z y z R x ---, C 、zyz R x ,-- D 、zyz R x ,- 6、设圆心在原点,半径为R ,面密度为22y x +=μ的薄板的质量为( )(面积A=2R π) A 、R 2A B 、2R 2A C 、3R 2A D 、A R 221 7、级数∑∞=-1)1(n nnn x 的收敛半径为( )A 、2B 、21C 、1D 、3 8、cosx 的麦克劳林级数为( )A 、∑∞=-0)1(n n)!2(2n x n B 、∑∞=-1)1(n n )!2(2n x n C 、∑∞=-0)1(n n )!2(2n x n D 、∑∞=-0)1(n n)!12(12--n x n9、微分方程(y``)4+(y`)5+y`+2=0的阶数是( )A 、一阶B 、二阶C 、三阶D 、四阶 10、微分方程y``+3y`+2y=0的特征根为( ) A 、-2,-1 B 、2,1 C 、-2,1 D 、1,-2 二、填空题(本题共5小题,每题4分,共20分) 1、直线L 1:x=y=z 与直线L 2:的夹角为z y x =-+=-1321___________。
大学生魅力讲话实操期末试卷(1).docx
大学生魅力讲话实操期末试卷1成绩:97.0分一、单选题(题数:50,共50.0 分)1上讲台讲话时“停3秒”不能使讲话者实现的目的是什么?()1.0 分A、稳胆B、稳场C、稳赢D、稳速我的答案:C2通过加手势能够克服心理障碍,专注讲话哪一方面?()1.0 分A、声音B、形式C、气息D、内容我的答案:D3耳语练声法具有哪些好处?()1.0 分A、美身B、美声C、美神D、以上都对我的答案:D4下面哪一项不能使讲话内容变得生动?()1.0 分A、故事B、细节C、数字D、逻辑我的答案:D5触觉练习发声“n”时,手指应指住哪个部位?()1.0 分A、鼻子B、嘴角C、耳朵D、眉头我的答案:A6下面哪一项不是“走稳”的要领?()1.0 分A、脚后跟先落地B、走挺C、脚尖先落地D、走看我的答案:C7下面哪一项不属于“三时法”的内容?()1.0 分A、问时法分时法C、对时法D、超时法我的答案:D8下面哪一项不是“当众讲话”定义中的要素?()1.0 分A、一人对多人B、有稿讲话C、口、手、脸共同参与D、多媒体表达我的答案:B9“低开高走”就是说讲话或者宣读讲稿时,声调要做到下面哪个方面?()1.0 分A、前高后低B、前高后高C、前低后高D、前低后低我的答案:C10“三定练胆法”中的“三定”包括笑定、眼定和下面哪个方面?()1.0 分A、立定B、必定C、说定D、我的答案:D11以下哪一项不是当众讲话的实战技巧?()1.0 分A、前看后读B、低开高走C、四说结构D、字音矫正我的答案:A12耳语练声法的要求包括:小、一、慢和下列哪一项?()1.0 分A、准B、静C、散D、力我的答案:C13练习“双人舞”的好处有哪些?()1.0 分A、练情B、练形C、练条理D、以上都对我的答案:D14讲话效果的“二八规则”中的20%是指什么?()A、听觉B、视觉C、味觉D、感觉我的答案:A15“低开高走”就是说讲话或者宣读讲稿时,声调要做到下面哪个方面?()1.0 分A、前高后低B、前高后高C、前低后高D、前低后低我的答案:C16下面哪一项不属于双人舞的“三动”要领?()1.0 分A、活动B、生动C、联动D、先动我的答案:A17提升当众讲话魅力的方法包括耳、()、舞、诀。
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八年级下学期数学期末复习题1
一、单项选择题(每小题3分,共30分)
1.下列函数中,自变量x的取值范围是x≥2的是( )
A.y=2x B.y=12x C.y=24x D.y=2x·2x
2、若直角三角形的两条直角边各扩大2倍,则斜边扩大 倍。 ( )
(A) 2 (B)4 (C) 6 (D)8
3.下列变形中,正确的是( )
(A)(23)2=2×3=6 (B)2)52(=-52
(C)169=169 (D))4()9(=49
4.一次函数y=-5x+3的图象经过的象限是( )
A.一、二、三 B.二、三、四
C.一、二、四 D.一、三、四
5.已知一次函数的图象与直线y=-x+1平行,且过点(8,2),那么此一次函数的解析式为( )
A.y=-x-2 B.y=-x-6 C.y=-x+10 D.y=-x-1
6. 如图,平行四边形ABCD中,AE平分DAB,100B,则DAE等于( ) (A)100 (B)80 (C)60 (D)40 7.若样本x1,x2,…,xn的平均数为10,方差为3,则对于样本x1+2,x2+2,…,xn+2,下列结论正确的是( ) (A)平均数为10,方差为3; (B)平均数为12,方差为5; (C)平均数为12,方差为3; (D)平均数为12,方差为9 8.如图,在Rt△ABC中,∠BAC=90°,D、E分别是AB、BC的 中点,F在CA延长线上,∠FDA=∠B,AC=6,AB=8,则四 边形AEDF的周长为( ) (A)16 (B)20 (C)18 (D)22 9.已知:如图,在矩形ABCD中,E、F、G、H分别为边AB、BC、CD、DA的中点.若AB=2,AD=4,则图中阴影部分的面积为 ( ) A.8 B.6 C.4 D.3 10.某次体育活动中,统计甲、乙两班学生每分钟跳绳的成绩(单位:次)•情况如下表: 班级 参加人数 平均次数 中位数 方差 甲班 55 135 149 190 乙班 55 135 151 110 下面有三个命题: ①甲班学生的平均成绩高于乙班学生的平均成绩. ②甲班学生成绩的波动比乙班学生成绩的波动大. ③甲班学生成绩优秀的人数不多于乙班学生成绩优秀的人数(跳绳次数≥150次为优秀). 则正确的命题是( ) (A)① (B)② (C)③ (D)②和③ 二、填空题(每小题3分,共24分) 11.已知一次函数y=-3x+1的图象经过点(a,1)和点(-2,b),则a+b=________. 12. 如图,BD是□ABCD的对角线,点E、F在BD上,要使四边形AECF是平行四边形,还需要增加的一个条件是 (填上你认为正确的一个即可,不必考虑所有可能情形). 13.如图,在正方形ABCD中,E是对角线BD上任意一点,过E作EF⊥BC于F,作EG⊥CD于G,若正方形ABCD的周长为m,则四边形EFCG的周长为 . 14.初中(1)班50人,初二(2)班52人,在期末数学考试中(1)班平均90分,(2)班平均94分,则这两个班的平均成绩约是________. 15.已知三角形三内角之比为1︰2︰3,最大边长是10cm,该三角形的周长是 。 16.如图,l是四形形ABCD的对称轴,如果AD∥BC,有下列结论:
①AB∥CD ②AB=BC ③AB⊥BC ④AO=OC
其中正确的结论是 。(把你认为正确..的结论的序号都填上)
17.已知点A(2,1),点B(2,2),点C(4,3)请你写出一个点D的坐标 ,
使它与A、B、C三点能构成一个平行四边形.
18. 如图,一次函数y=kx+b的图象经过A、B两点,与x轴交于点C,则此一次函数的解析式为__________,
△AOC的面积为_________.
三、解答题(共6小题,共46分)
19.(48-814)-(313-5.02)
x
y
1
2
3
4
-2
-1
C
A
-1
4
321O
20.(10分)小明和小兵参加某体育项目训练,近期的8次测试成绩(分)如下表:
测试 第1次 第2次 第3次 第4次 第5次 第6次 第7次 第8次
小明 10 10 11 10 16 14 16 17
小兵 11 13 13 12 14 13 15 13
(1)根据上表中提供的数据填写下表:
平均数 众数 中位数 方差
小明 10 8.25
小兵 13 13
(2)若从中选一人参加市中学生运动会,你认为选谁去合适呢?请说明理由.
21. 已知:如图,四边形ABCD是平行四边形,E、F是直线BD上的两点,且BFDE。
求证:CFAE.
22. 如图,四边形ABCD中,ABCD∥,AC平分BAD,CEAD∥交AB于E.
(1)求证:四边形AECD是菱形;
(2)若点E是AB的中点,试判断ABC△的形状,并说明理由.
23.如图,A市气象站测得台风中心在A市正东方向300千米的B处,以107千米/时的速度向北偏西
60°的BF方向移动,距台风中心200千米范围内是受台风影响的区域.
(7≈2.646)
(1)A市是否会受到台风的影响?用所学的知识说明;
(2)如果A市受这次台风影响,那么受台风影响的时间有多长?
24.(12分)已知雅美服装厂现有A种布料70米,B种布料52米,•现计划用这两种布料生产M、
N两种型号的时装共80套.已知做一套M型号的时装需用A种布料1.•1米,B种布料0.4米,可获利
50元;做一套N型号的时装需用A种布料0.6米,B种布料0.•9米,可获利45元.设生产M型号的时
装套数为x,用这批布料生产两种型号的时装所获得的总利润为y元.
①求y(元)与x(套)的函数关系式,并求出自变量的取值范围;
②当M型号的时装为多少套时,能使该厂所获利润最大?最大利润是多?