第八次周末练考题
第八次周练及答案
崇仁一中2015届高三上学期第八次英语周练试题命题人：审题人：高三英语备课组时长：100分钟满分：120分第Ⅰ卷第一部分: 阅读理解（共两节，满分40分）第一节: （共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并将答案填写到答题卷上。
AName: Sam ChampionHot job: TV WeathermanWhere: W ABC-TV, New York CityWhen you were a child, did you plan to forecast wind, rain, and snow on TV?I wanted to be a foreign journalist. I took courses in weather science at Eastern Kentucky University, but I majored in broadcasting newsHow did you finally become a weatherman?My first job in the early 80’s was at the local TV station in Paducah, Kentucky. I did everything from turning on the lights in the morning to writing and delivering morning news. I put together weather forecasts, and become interested in them.Back then, how did you forecast weather?Independent companies collected computer information that showed, for example, how a single weather system might split into snow or snow mixed with rain. The information was often opposite and the job of a weather man was to study the information and make the best educated guess about the stormHas weather forecasting changed much with new technology?Advanced computers, satellites, and Doppler radar（sound waves used to track storms）have made forecasting more exact. But we still know very little about how weather is shaped. So far, we just have theories.Any advice for children who’d like to become weather scientists?To me, weather is the most exciting field in the world. There are still so many more questions about weather than answers. After all, if we can’t foresee floods or hurricanes, how safe a society are we? Weather forecasting is wide open for scientists who love to solve puzzling problems. The next generation of meteorologists will unlock many of Earth science, and study meteorology in collegeThanks, Sam1. Judging from the writing style, the text is_______.A. a diaryB. an interviewC. a news storyD. an announcement2. As a child, ABC-TV’s Sam Champion wanted to be a _______.A. space scientistB. weathermanC. news reporterD. meteorologist3. Present weather forecasting technology_______.A. has made weather report more exact than everB. is still not perfectC. hasn’t changed much in the last 50 yearsD. both A and BBMy husband and I had just opened up a pet sitting business earlier that year. Our customers had slowly risen from three to thirty a month. We were busy through those hot summer months, driving between visits. Our services were strictly held at the pet owner’s home. It was almost too busy for the two of us, but we were making good money!We asked pet owners new to our services to phone two weeks ahead so we had enough time to meet the owners and pets at their homes and make any following meetings before the owner leaves.One day, we decided to take on a new customer just two days before they would leave. We met the family, filled in a form, and spent some time with their dog, Hercules. He playfully jumped on us and touched our hands and arms using his tongue. The family laughed as he did this, showing us that he was very loving.Two days later I appeared at the house, alone. I came up to Hercules and said hello happily. I filled up his water bowl and cleaned any messes he made. Meanwhile, he was so lovely sitting beside. I thought this would be the good picture to send to the owners, a usual service. After the light and “click” sound went off, Hercules rushed at me. I didn’t know what had just happened until I noticed the drops of blood. I ran out and did the only thing — calling my husband.Then I went to neighbors for help. My husband arrived after ten minutes. The helpful neighbor and my husband led Hercules back into his pen (圈). Then my husband and I took off to the hospital.I must have looked like I was shot when I walked into the hospital. The nurses quickly moved me to a room. I asked the doctor in a weak but playful manner, “ Am I going to die？” He replied, “Finally.”4. According to the text, the author’s work was .A. tiring and dangerousB. easy and freeC. well paidD. done outdoors5. What did the author often do during her work?A. Cleaning the clients’ house.B. Walking the pets outside.C. Bringing the pets to her own house.D. Taking a photo of pets to the owners.6. It can be inferred from the text that the author was attacked because .A. Hercules feared the sound and the flashB. the author attacked Hercules firstC. Hercules was very hungry thenD. the author treated Hercules badly7. The doctor’s answer gave us a sense of .A. angerB. humorC. carelessnessD. patienceCAlthough man has known asbestos(石棉) for hundreds of years, it was not until 160 years ago that it was mined for the first time on the North American continent. H.W.Johns, owner of a New York City Supply Shop for roofers，was responsible for the opening of that first mine.Mr. Johns was given a piece of asbestos which had been found in Italy. He experimented with the material and then showed its surprising powers to his customers. After putting on a pair of asbestos gloves，which looked much like ordinary work gloves，he took red-hot coals from the fireplace and played with them in his hands. How astonished the customers were to discover that he was not burned at all. You can well imagine that he had increased business in asbestos roofing materials. However，because it was very expensive to transport them from Italy to the United States, Mr. Johns sent out a young scientist to seek a source nearer home. This young man found great vein, in the province of Quebec in Canada.Ever since 1881 Quebec has led the world in the production of this unusual mineral，which is made up of magnesium, silicon, iron, and oxygen. When it is mined, the asbestos is heavy, just asyou would expect a mineral to be. When it is separated，a strange thing happens; the rock breaks down into fine, soft, soapy fibers.Scientists do not know why the rock can be separated easily into threads(线)，but they have found thousands of uses of this fireproof material, of the so- called “cloth of stone.”8. Which title best expresses the main idea of this passage?A. Asbestos mined in CanadaB. Fireproof materialC. A “wonder” materialD.A new roofing material9. Johns proved his ability as a salesman by___.A. going into roofing businessB. carrying asbestos from ItalyC. sending out a trained scientistD. showing the use of asbestos gloves10. Which is an important character of asbestos that the author wants to show us?A. It can be separated into threadsB. It feels soapyC. It burns easilyD. It is unusually heavy11. T he author’s main purpose in writing the passage was to___.A. show the need for more scientistsB. compare asbestos with other materialsC. increase the sales of asbestosD. present facts about asbestosDA new study suggests that sad music might actually arouse positive emotions. The finding helps to explain why people enjoy listening to sad music, say Ai Kawakami and her colleagues from Tokyo University of the Arts and the RIKEN Brain Science Institute, Japan. Ai Kawakami and her colleagues asked 44 volunteers, including both musicians and nonspecialists, to listen to two pieces of sad music and one piece of happy music. Each participant was required to use a set of keywords to rate both their perception(观念) of the music and their own emotional state.The sad pieces of music included Glinka’s La Separation in F minor and Blumenfeld’s Etude Sur Mer in G minor. The happy music piece was Granados’s Allegro de Concierto in G major. To control the “happy” effect of major key, they also played t he minor key(小调) pieces in major key, and vise versa.The researchers explained that sad music aroused contradictory emotions because the participants of the study tended to feel sad to be more tragic and less romantic than they felt themselves while listening to it.“ In general, sad music causes sadness in listeners, and sadness is regarded as an unpleasant emotion. If sad music actually arouses only unpleasant emotion, we would not listen to it,” the researchers wrote in the study.“Music that is believed as sad actually causes romantic emotion as well as sad emotion. And people, regardless of their musical training, experience this ambivalent(矛盾的) emotion to listen to the sad music,” added the researchers.Also, unlike sadness in daily life, sadness experienced through art actually feels pleasant, possibly because the latter does not cause an actual threat to our safety. This could help people to deal with their negative emotions in daily life, concluded the authors.“Emotion experienced by music has no direct danger or harm unlike the emotion experienced in everyday life. Therefore, we can even enjoy unpleasant emotion such as sadness. If we suffer from unpleasant emotion aroused through daily life, sad music might be helpful to alleviate negative emotion,” they added.12.People enjoy listening to sad music because _______.A. sad music may help arouse positive emotionsB. sad music can make people relaxC. Sad music has a positive effect on people’s healthD. many experts recommend people to listen to sad music13. We can learn from the passage that _______.A. sad music only causes sadness in listenersB. Only musicians were invited to take part in the surveyC. The volunteers were asked to listen to three pieces of music in allD. Granados’s Allegro de Concierto in G major can cause positive emotions14. The underlined word “alleviate” in the last paragraph means “ ”.A. addB. strengthenC. causeD. reduce15. What is the main idea of this passage?A. People should listen to sad music.B. Happy music can make people sad.C. Sad music may actually cause positive emotions.D. Sad music is really bad to people.第二节（共5小题；每小题2分，满分10分）根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。
2021年高二上学期数学(文)第八周双休练习含答案
一中高二(文)数学xx年秋学期第八周双休练习2021年高二上学期数学(文)第八周双休练习含答案一.填空题(本大题共14小题，每小题5分，共70分.请将答案直接写在下列横线上)1. 与曲线y=x3-5x相切且过原点的直线的斜率为2. 已知(x-1)2+(y-1)2=1，则x+y的最大值为________________．3. 曲线在点(1 ，)处切线的倾斜角为4. 曲线，在外切线斜率为8，则此切线方程是_____．5. f(x)=ax2+bx+c的图象开口向上，且顶点在第二象限，则y=f′（x）的图象大概是：（）6.（）A．在(-，0)上为减函数B．在x=0处取得最大值C．在（4，+）上为减函数D．在x=2处取得最小值7.已知椭圆的左焦点是，右焦点是，点P在椭圆上，如果线段的中点在y轴上，那么________________．8.已知椭圆中心在原点，一个焦点为F（，0），且长轴长是短轴长的2倍，则该椭圆的标准方程是________________．9.若双曲线渐近线方程为，且过点（2，），则双曲线方程是_____ __．10.已知椭圆的焦点在y轴，则实数m的取值范围是________________．11.已知，B是圆F：(F为圆心)上一动点，线段AB的垂直平分线交BF于P，则动点P的轨迹方程为________________．12.一个椭圆的短半轴长是，离心率是，焦点为，弦AB过，则的周长为________________．13. 若函数在区间上不是单调函数，则实数的取值范围_______________．14. 曲线在点在（1，2）处的切线方程是二.解答题(本大题共6小题，共90分. 请写出详细解答过程)15. 已知函数f(x)=x3+bx2+cx+d满足以下3个条件：①在，0]上为增函数②在上为减函数③f(2)=01）求c的值；2）求f(1)的范围。
B C D16. 已知圆和直线相交于两点,O为原点,且,求实数的取值.17. 设是双曲线的两个焦点，P是双曲线上一点，已知，求点P到两点的距离之和.18．设是定义在上的偶函数，与的图象关于对称，且当时，（1）求的解析式；（2）求的单调区间及最小值.19.已知a为实数，（Ⅰ）求导数；（Ⅱ）若，求在上的最大值和最小值；（Ⅲ）若在（—∞，—2]和，a∈(0,1)求g(x)的最大值F(a)的解析式．答案1.-52.3. 135°4.5. C6. C7.8. 9. 10. 11. 12. 13. 或14.15.①由条件①②知，x=0为y=f(x)的极值点又∴②由于c=0 则f(x)=x3+bx2+d 从而f(1)=1+b+d又知：f(2)=8+4b+d=0d=-8-4b 则f(1)=-3b-7由②知，∴f(1)≥(-3)×(-3)-7=2故f(1)≥216解: 设点的坐标分别为.一方面,由,得,即从而,另一方面, 是方程组即是方程……②的两个实数根，∴，又在直线，∴将③式代入，得…………④又将③，④式代入①，解得，代入方程②，检验成立。
八年级物理下学期第8周周末试题试题
卜人入州八九几市潮王学校大丰刘庄镇三圩初级二零二零—二零二壹八年级物理下学期第8周周末试题一、知识点梳理l 、力的概念：称为力。
2、力产生的条件：①必须有两个或者两个以上的物体，其中一个叫物体，另一个叫物体。
②物体间必须有互相作用〔但不一定要接触〕。
3、力的互相性：一个物体对另一个物体有力的作用时，另一个物体对这个物体(也有/没有)力的作用时，即力的作用是，所以这两个力也叫作用力和反作用力或者互相作用力。
两物体互相作用时，施力物体同时也是受力物体，反之，受力物体同时也是施力物体。
互相作用的两个力的性质：大小、方向、作用在同一，但作用在上。
4、力的表示符号：通常的力用表示，重力用表示，摩擦力用表示。
5、力的单位：国际单位制中力的单位是，简称，用表示。
6、力的作用效果：⑴力可以使物体了发生，包括的改变和体积的改变。
7、力的三要素：力的、和称为力的三要素，因为这三个因素都能影响到力的作用效果。
8、力的示意图：用一条把力的大小、方向、作用点表示出来,其中线段的表示力的大小、表示力的方向、线段的表示物体受力的作用点。
⑵力可以使物体的运动状态发生改变方向发生改变运动速度发生变化由静止变为运动 由运动变为静止9、弹力①弹力的定义：物体由于而产生的力叫弹力②弹簧受力与弹性形变的关系：弹簧所受外力越大，弹簧的形变就；反之，弹簧的形变，就说明弹簧所受外力。
弹簧测力计⑴作用：测量力的大小；⑵原理：；⑶构造：、挂构、指针、、外壳⑷弹簧测力计的使用①仔细观察弹簧测力计的和，加在弹簧测力计上的力不许超过它的量程。
还要观察指针是否指向，假设不在，应先将指针调到零点。
②测量时力的方向应与弹簧的一致，注意防止指针、弹簧与外壳接触。
③读数时视线与刻度面垂直。
10、重力重力的概念：地面附近的物体，由于而受的力叫重力。
重力的施力物体是。
重力的三要素⑴重力大小——物体所受重力的大小与成正比，计算公式：。
其中g=N/kg，它表示质量为1kg的物体所受的重力为N。
八年级下学期第八周周练试题试题
卜人入州八九几市潮王学校内蒙古康巴什新区第二二零二零—二零二壹八年级下学期第八周周练语文试题姓名给以下加点字注音器皿〔〕罔不〔〕贻〔〕有奇〔〕黍〔〕箬篷〔〕糁〔〕峨冠〔〕髯〔〕衣褶〔〕诎〔〕楫〔〕椎髻〔〕壬戌〔〕虞山〔〕篆章〔〕写出以下字的意思1.明有奇巧人9.清风徐来，水波不兴12.佛印居右13.东坡右手执卷端14.左手抚鲁直背15.如有所语16.东坡现右足17.其两膝相比者18.佛印绝类19.矫首昂视20.神情与苏、黄不属21左臂挂念珠倚之22.珠可历历数也23舟尾横卧一楫24.居右者椎髻仰面25.假设啸呼状26.右手攀右趾27.视端容寂28.假设听茶声然29.其船背稍夷30虞山王毅叔远甫刻31.钩画了了，其色墨32其色丹33.长曾不盈寸34.盖简桃核修狭者为之找出以下句中的通假字并解释1.舟首尾长约八分有奇2.诎右臂支船3.左手倚一衡木比较以下字在句中的含义①其：其两膝相比者②曰：明有奇巧人曰王叔远其人视端容寂文曰“初平山人〞③奇：明有奇巧人④有：明有奇巧人长约八分有奇长约八分有奇⑤为：为宫室、器皿、人物⑥而：中峨冠而多髯者为东坡中峨冠而多髯者为东坡启窗而观为予群从所得而计其长曾不盈寸⑦可：高可二黍许⑧之：径寸之木珠可历历数也盖简桃核修狭者为之五、按要求填空1.核舟记选自清代张潮编的。
本文作者是，字子敬，〔朝代〕嘉善人。
2.赋后赋的作者是宋代文学家_________。
“山高月小，〞是出自；“，水波不兴〞出自。
3．点明核舟主题的句子是。
4．第三段中作者以对人物姿态、神情的生动细腻的描绘，详细说明雕刻人“，〞(从第一段文字中找)的精湛技艺。
5．从第四段对右边舟子的描绘中可以看出他的神态，而左边舟子的神态那么显得。
6．最后一段运用了、的说明方法，作用是。
7．点明全文中心的句子是。
8核舟记体裁，说明对象是，对象特征是，介绍核舟时先介绍船舱，再船头，接着船尾，最后介绍船底，说明顺序是。
六、翻译以下句子，注意倒装句和略的量词。
高二下期第8次周数学试题
周考试卷一、选择题1．已知222:450,:210p x x q x x λ-->-+->，若p 是q 的充分不必要条件，则正实数λ的取值范围是A ．(]0,1B ．()0,2C ．30,2⎛⎤ ⎥⎝⎦D ．(]0,22．已知命题x x R x p lg 2,:>-∈∃，命题0,:2>∈∀x R x q ,则（ ） A ．命题q p ∨是假命题 B ．命题q p ∧是真命题 C ．命题)(q p ⌝∧是真命题 D ．命题)(q p ⌝∨是假命题3．已知命题p ：,cos 1,x R x ∀∈≤则（ ）A ．:,cos 1;p x R x ⌝∃∈≥B ．:,cos 1;p x R x ⌝∀∈≥C ．:,cos 1;p x R x ⌝∃∈>D ．:,cos 1;p x R x ⌝∀∈>4．要从已编号（1～60）的60枚最新研制的某型导弹中随机抽取6枚来进行发射试验，用每部分选取的号码间隔一样的系统抽样方法确定所选取的6枚导弹的编号可能是（ ） A ．5,10,15,20,25,30 B ．3,13,23,33,43,53 C ．1,2,3,4,5,6 D ．2,4,8,16,32,48 5．已知与y 之间的几组数据如下表:则y 与x 的线性回归方程ˆˆˆybx a =-必过（ ） A ．()1,3 B ．()2,5 C ．()1.5,4 D ．()3,7 6．某程序图如图所示，该程序运行后输出的结果是（ ）A ．3B ．4C ．5D ．6 7．已知焦点在x 轴上的椭圆的离心率为21，它的长轴长等于圆222150x y x +--=的半径，则椭圆的标准方程是（ ）A ．1121622=+y x B ．1422=+y x C ．141622=+y x D ．13422=+y x8．已知双曲线()222210,0x y a b a b-=>>的其中一条渐近线平行于10y +=,则双曲线的离心率为（ ）A.229．已知椭圆G 的中心在坐标原点，长轴在x 轴上，离心率为2，且椭圆G 上一点到其两个焦点的距离之和为12，则椭圆G 的方程为（ ）A..22149x y += B.22194x y += C.221369x y += D.221936x y += 10．抛物线24y x =的焦点为F ，点,A B 在抛物线上，且0120AFB ∠=，弦AB 中点M 在其准线上的射影为N ，则||||MN AB 的最大值为（ ）（A ）3 （B ）3 （C （D ）311．直线220x y -+=经过椭圆22221(0)x y a b a b+=>>的一个焦点和一个顶点，则该椭圆的离心率为（ ）A.122312．双曲线12222=-b x a y 与抛物线y x 82=有一个公共焦点F ，双曲线上过点F 且垂直实轴的弦长为332，则双曲线的离心率等于 （ ） A.2 B.332 C.223 D.3 二、填空题13．某学校高一、高二、高三年级的学生人数之比为3：3：4，现用分层抽样的方法从该校高中三个年级的学生中抽取容量为50的样本，则应从高二年级抽取 名学生. 14．阅读如图所示的程序框图，如果输入的n 的值为6，那么运行相应程序，输出的n 的值为 ．15．设21F F ，分别是椭圆1162522=+y x 的左、右焦点，P 为椭圆上一点，M 是P F 1的中点，3=OM ，则P 点到椭圆左焦点距离为________．16．若点A 的坐标为（3，2），F 为抛物线22y x =的焦点，点P 是抛物线上的一动点，则PA PF +取得最小值时，点P 的坐标是 。
2019-2020年高一下学期第8周数学周末练习
2）求鱼群的年增长量达到的最大值； 3）当鱼群的年增长量达到最大值时，求 k 的取值范围。（ 16 分）
一中高一数学 xx 春学期第八周双休练习答案：
1..提示：直线 2x-3y+6=0 的下方的点的坐标必须满足 2.(－ 4,0)。提示：△ =a2+4a<0.
2x-3y+6<0, 代入可得。
3.{x|x＞ 1 或－ 2＜ x＜－ 1}。提示：原不等式等价于 (x－ 1)lg(x＋ 2)＞ 0，即 x＞ 1 或－ 2＜x
是
.
3.不等式 xlg(x＋ 2)>lg(x＋2)的解集是
.
4.若不等式 f(x)≥ 0 的解集是，不等式 g(x)≥0 的解集为 ? ，且 f(x)， g(x)的定义域
为
R，则不等式
f(x) g(x)>0
的解集为
.
11
5.已知 x>0，y>0，x＋y＝1，则 (1＋x)(1＋ y)的最小值是
.
6. 若 x 、 y 满 足 约 束 条 件 ， 则 z=x+2y 的 取 值 范 围 是
为ห้องสมุดไป่ตู้
.
12 ． 不 等 式 对 一 切 恒 成 立 ， 则 实 数 的 取 值 范 围 是
___________________________. 13． 下列四个命题中： ① a+b≥ 2 ②sin2x+≥4 ③设 x，
y 都是正数，若 =1，则 x+y 的最小值是 12 ④若 , 则 2,，
其中所有真命题的序号是 __________.
可见当 y＝ x＋w 分别过 B 与 C 点时，得最大与最小，
∴ w≥ － 1， w≤ 3，选 C. 8.-2. 提示：因 x2+y 2≥2|xy|= -2xy ，又 xy ＜ 0, 故≤ -2. 9.7.提示：≥ 2+1=2+1=2 × 3+1=7
八年级下期第八次周清试题
狮中 2014-2015 学年下期第八次周清八年级数学试卷班级 ____________姓名 _______________一、选择题 （每题 5 分，共 30 分）1．函数是一次函数，则 m 的值是 ()A.2B.-2C. 2或 -2D.02．一次函数 y2x3的图象不经过的象限是 ( )A. 第一象限B. 第二象限C. 第三象限D. 第四象限3．一次函数 ykx b 的图象如图，则 ()k1k13B.3A.b1 b 1 k 3k1D.3C.1bb14．若一次函数 y(1 2k)xk 的函数值 y 随 x 的增大而增大，且此函数的图象不经过第二象限，则k 的取值范围是（ ）D. k ＜1D.k ＞0D. 0＜ k ＜1D. k ＜ 0或 k ＞12225．一次函数 y mx n 的图象经过二、三、四象限，则化简(m n) 2n 2所得的结果是（）A. mB. mC.2m nD.m 2n6．如图，点 P 是等边△ ABC 的边上的一个作匀速运动的动点，其由点 A 开始沿 AB 边运动到 B 再沿 BC 边运动到 C 为止，设运动时间为 t ，△ ACP 的面积为S ， S 与 t 的大概图象是（）AS S SSPOtO t Ot O tCBABCD第1页共4页二、填空题（每题 5 分，共 35 分）7．函数 y＝2x 1 的自变量 x 的取值范围是 ___________________8.函数 y=3x-6 的图象与 y 轴的交点为 _______________, 与 x 轴的交点为______________，与两坐标轴围成的三角形面积为 ____________.9.函数y=kx+b 的图象平行于直线y=-2x ，且与y 轴交于点（0，3），k=_____，b=_____．10.写一个图象经过点（1，2）的一次函数的分析式.11.已知 y 与 2x1成正比率，当 x 5时， y 2 ，则 y 与x之间的函数关系式为．12.若点A（5， y1），B（2， y2）都在直线y 1x + m上，则y1y2 2（填“＞”、“ =”或“＜”） .13．函数 y=（ k-2)x - 1+k 经过第一、二、四象限，k 的范围是 ____________三、解答题（共 35 分）14.（此题 15 分）已知，函数 y 1 3k x 2k 1，试回答：（1）k为什么值时，图象过原点？（2）k为什么值时，y随 x 增大而增大？15. （此题 20 分）已知一次函数图象经过点(3 , 5) , ( 4 ，9 )两点.(1)求一次函数分析式 .(2)求图象和坐标轴围成三角形面积 .第2页共4页。
2021年高三上学期第八次周考物理试卷 含答案
2021年高三上学期第八次周考物理试卷含答案一、选择题：1．如图所示，两相同轻质硬杆、可绕其两端垂直纸面的水平轴、、转动，在点悬挂一重物M，将两相同木块m紧压在竖直挡板上，此时整个系统保持静止。
表示木块与挡板间摩擦力的大小，表示木块与挡板间正压力的大小。
若挡板间的距离稍许增大后，系统仍静止且、始终等高，则（）A．变小B．不变C．变小D．变大【答案】BD2．如图所示，劲度系数为k的轻弹簧的一端固定在墙上，另一端与置于水平面上质量为m的物体接触（未连接），弹簧水平且无形变。
用水平力F缓慢推动物体，在弹性限度内弹簧长度被压缩了x0，此时物体静止。
撤去F后，物体开始向左运动，运动的最大距离为4x0。
物体与水平面间的动摩擦因数为μ，重力加速度为g。
则A．撤去F后，物体先做匀加速运动，再做匀减速运动B．撤去F后，物体刚运动时的加速度大小为－μgC．物体做匀减速运动的时间为2D．物体开始向左运动到速度最大的过程中克服摩擦力做的功为μmg（x0－）3．(xx·海南物理)在水平的足够长的固定木板上，一小物块以某一初速度开始滑动，经一段时间t后停止．现将该木板改置成倾角为45°的斜面，让小物块以相同的初速度沿木板上滑．若小物块与木板之间的动摩擦因数为．则小物块上滑到最高位置所需时间与t之比为A．B．C．D．【答案】A4．一人造地球卫星绕地球做匀速圆周运动，假如该卫星变轨后仍做匀速圆周运动，动能减小为原来的，不考虑卫星质量的变化，则变轨前后卫星的A．向心加速度大小之比为4：1B．角速度大小之比为2：1C．周期之比为1：8D．轨道半径之比为1：25在测量电珠伏安特性实验中，同学们连接的电路中有两个错误电路，如题20图所示。
电源内阻不计，导线连接良好，若将滑动变阻器的触头置于左端，闭合S，在向右端滑动触头过程中，会分别出现如下四种现象：a.电珠L不亮；电流表示数几乎为零b.电珠L亮度增加；电流表示数增大c电珠L开始不亮；后来忽然发光；电流表从示数不为零到线圈烧断d.电珠L不亮；电流表从示数增大到线圈烧断与上述a b c d 四种现象对应的电路序号为A. ③①②④B. ③④②①C. ③①④②D. ②①④③E（6V，1Ω）S 1 2L1（6V，16W）L（6V，1.2W）L2（6V，16W）6．如图所示，电动势为E、内阻不计的电源与三个灯泡和三个电阻相接。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
旬邑中学高一数学第八次周末练考题
一、选择题(本大题共10小题，每小题5分，共50分)
1.已知集合A={x||x|≤2},B={x|x ≤1},则A ∩B=( ) A.{x|x ≤2} B.{x|1≤x ≤2} C.{x|-2≤x ≤2} D.{x|-2≤x ≤1}
2.函数y x ln(1x)=-的定义域为（ ） A.(0,1)
B.[0,1)
C.(0,1]
D.[0,1]
3函数()()2ln 1=+f x x 的图像大致是
( )
.
4.下列函数中，既是偶函数又在区间(0,+ ∞)上单调递减的是( )
A.y=
1x
B.y=e -x
C.y=-x 2+1
D.y=lg ∣x ∣
5.已知a,b,c ∈R ,函数f(x)=ax 2+bx+c .若f(0)=f(4)>f(1),则( ) A.a>0,4a+b=0 B.a<0,4a+b=0 C.a>0,2a+b=0 D.a<0,2a+b=0
6.函数f （x ）=㏑x 的图像与函数g （x ）=x 2-4x+4的图像的交点个数为（ ） A.0 B.1 C.2 D.3
7.函数y=2-x 的图像可以看成是由函数y=2-x+1+3的图像平移后得到的, 平移过程是( )
A.向左平移1个单位,向上平移3个单位
B.向左平移1个单位,向下平移3个单位
C.向右平移1个单位,向上平移3个单位
D.向右平移1个单位,向下平移3个单位
8.已知f (x )是一次函数，且2f (2)－3f (1)＝5，2f (0)－f (－1)＝1,则f (x )的解析式为( )
A.3x －2
B.3x ＋2
C.2x ＋3
D.2x －3 9.若函数)(x f =)
)(12(a x x x
-+为奇函数，则a =（ ）
（A ）
21 （B ）32 （C ）4
3
（D ）1 10.设函数
则
()()
3f f =（ ）
（A ）15 （B ）3 （C ）23 （D ）139
二、填空题(本大题共5小题，每小题5分，共25分.) 11.数集2{2,}a a a +，则a 不可取值的集合为 . 12.设()f x 是定义在Ｒ上的奇函数，当0x ≤时，
()22f x x x =-，则
()1f = .
13.已知函数x x f lg )(=若f （ab ）=1，则f （a 2）+f （b 2）= . 14.函数y ＝
1
2x ＋1
的值域是________. 15.函数a ax x x f -++=12)(2在区间［0,1］上有最大值2， 则实数a 的值为________.
三、解答题(本大题共5小题，共75分.）
16.全集U＝R，A＝{x||x|≥1}，B＝{x|x2－2x－3＞0}，求(C U A)∩(C U B).
17设定义在［-2,2］上的奇函数f(x)在区间［0，2］上是减少的，若f(1-m)<f(m),求实数m的取值范围.
18.对于函数y=错误！未找到引用源。
.
(1)求函数的定义域、值域.
(2)确定函数的单调区间.
19.学校某研究性学习小组在对学生上课注意力集中情况的调查研究中,发现其在40分钟的一节课中,注意力指数y与听课时间x(单位：分钟)之间的关系满足如图所示的图像.当x∈(0,12]时,图像是二次函数图像的一部分,其中顶点A(10,80),过点B(12,78);当x∈[12,40]时,图像是线段BC,其中C(40,50).根据专家研究,当注意力指数大于62时,学习效果最佳.
(1)试求y=f(x)的函数关系式.
(2)教师在什么时段内安排核心内容,能使得学生学习效果最佳?请说明理由
20.已知函数f(x)=
a
log
3
3
+
-
x
x
(a>0且a≠1)
(1)求函数f(x)的定义域.
(2)判断f(x)的奇偶性并证明.
(3)若a=
2
1
,当x∈[5,9]时,求函数f(x)的值域.。