快乐作业7
2021年高一下学期英语暑假快乐学习作业(七)含答案
xx.72021年高一下学期英语暑假快乐学习作业（七）含答案开心微博——快乐每一天Such An InterpretationA famous writer who was visiting Japan was invited to give a lecture at a university to a large group of students. As most of them could not understand spoken English, he had to have an interpreter.During his lecture he told an amusing story which went on for rather a long time. At last he stopped to allow the interpreter to translate it into Japanese, and was very surprised when the man did this in a few seconds, after which all the students laughed loudly. After the lecture, the writer thanked the interpreter for his good work and then said to him, “Now please tell me how you translated that long story of mine into such a short Japanese one.”“ I didn’t tell the story the at all,” the interpreter answered with a smile. “I just said,‘The honorable lecturer has just told a funny story. You will all laugh, please.’”多思善想创新每一天Ⅰ.单词拼写1、These books b_____ to Sarah. I must give them back to her.2、When the boiler e_____, many people were injured.3、At present, we have no e_______of life on others plants.4、He has been working hard these days. There＇no d_____that he get goodmarks in the exam.5、Only in this way can they find better jobs after _________(毕业)。
苏教版小学语文练习作业7
不傲才以骄人，不以宠而作威。——诸葛亮
脑筋急转弯：公园路边放了一些椅子，从起点到终点共15把，每两把椅子之间有一头石狮子，问这条路边共有多少头石狮子？
括号里写出和带点词意思相反的词：我家离学校远，小刚家离学校（ ）。
按数字组成一句话：（1）牛顿（2）地球（3）有吸引力（4）发现
把句子说。马共（）画，第2画是（）。
小学
一年级语文题姓名：评分：
照例添空：漂亮漂漂亮亮进出___________许多___________方正___________
造句：一边……一边……
整理、排列句子，并加标点：二年级我就是下学期了学生的
填词：（）的骑手（）的公牛（）的地方（）的白发（）的爸爸（）的小草
加一笔，变另外一个字：日（）三（）大（）
寒假作业(7)
寒假作业(7)一、单项选择题1. －What a beautiful baby? How was he when he was born?－4 kilograms.A. heavyB. heavilyC. weightD. weigh2. －What are you busy ?－I’m busy the plan for the sports meeting.A. in, to makeB. with, to makeC. with, makingD. in, making3. －Do you often hear her in the next room?－Yes, I heard her a moment ago.A. sing, singB. singing, singingC. to sing, to singD. sing, singing4. －What are books used for?－They can us with knowledge.A. giveB. takeC. carryD. provide5. －Maria looks much healthier than she five years ago.A. didB. doesC. wasD. is6. －We walked the bridge and soon come to a hut.A. acrossB. throughC. onD. over7. －Sh e can‟t walk but she doesn‟t ha ve a wheelchair .A. sitB. sit inC. to sitD. to sit in8. －The experts think that India‟s population may be than China‟s 2020.A. much, byB. more, inC. larger, byD. larger, on9. －I’ve forgotten to bring my bread.－Never mind, you can have .A. some of usB. us someC. some of oursD. some of yours10. －We’ll have holiday next month.－Will you visit your uncle in Changsha?A. five-daysB. five days’C. five-dayD. a five-days二、阅读理解Pennsylvania-When Connie Beck and her husband woke up and heard strange noises last weekend, they thought high winds were rattling (发出格格的响声) their home.What they found was even more unexpected: A deer was taking a bubble (泡沫) bath in their bathtub.“I wasn‟t exactly dressed for company,” Mrs. Beck said, “We were just waking up.”The deer burst through the front door early Saturday, ran past the c ouple‟s bedroom and into the bathroom.Somehow he managed to turn on the water in the bathtub and knock over a bottle of bubble bath into the bathtub.He then got himself into the bubble water.“You could hear the water running over the kicking,” Beck said. The Becks called State Game Commission officials, who arrived with tranquilizers（镇定剂）and a lot of laughter.“A guy said, …There‟s nothing wrong… he‟s just in there taking a bubble bath,‟” Mrs. Becksaid.The animal was soon brought under control, removed from the house and released.“He was unharmed except for a little cut above the eye,”said Mrs. Beck, “We were also fortunate. There wasn‟t much damage, except for the front door, some marks on the tub, and a few hoof prints on the floor.”( )1. When did the story take place?A. In the late night of Friday.B. In the midnight of Saturday.C. On the early morning of Saturday.D. On Sunday evening.( )2. When Mrs. Beck said, “I wasn‟t exactly dressed for company,” she .A. was joking about the incidentB. meant she never liked people to visitC. explained she was about to go to workD. wished she could have new clothes( )3. After bursting through the door and entered the bathroom, the animal .A. managed to cover himself with bubblesB. kicked over the tubC. began to swim in the tubD. happened to turn on the bath taps( )4. The underlined word “hoof” most probably refers to .A. the foot of an animalB. the mouth of an animalC. the tail of an animalD. the waste of an animal( )5. Which of the following would be the best title for the text?A. A Dangerous DeerB. An Interesting WeekendC. An Unexpected VisitorD. A Bubble Bath三、阅读填词A girl came into the office, following the manager. She was so pretty that all the workers stopped to look carefully at her. Mr. Ball i 1 the newcomer to his workmates. The girl named Anne asked them to help her. Then she sat down at the desk next to Richard. The young man‟s heart b 2 faster.Richard was a newcomer, too. He learned a lot when he was at college. He was a 3 and the manager liked him very much. He was a young man of few words. So he could say nothing when he stayed with a girl. He wasn‟t married though he was n 4 thirty. His parents were worried about it and they asked their friends to do something helpful for the young man. Of course, the manager purposely (有意地) put Anne‟s desk there.Anne had little experience and often asked for Richard‟s a 5 . The young man, of course, tried his best to help her. And one day he helped the girl s 6 a problem. She asked him to have dinner with her the next evening.Mr. Ball and Richard‟s parents were all glad after they had heard it. His mother told him what he should say to the girl. She made her son learn them by h 7 . And when the dinner was o 8 and Anne was leaving, Richard stood up and stopped her. With a red face, the young man said what his mother told him. To his surprise, the girl r 9 .“I have a boy friend and we‟re going to mar ry this fall,” said Anne, “Don‟t be so sad, my friend. But I s10 enjoy your good insight (眼光)！”1. i2. b3. a4. n5. a6. s7. h8. o9. r 10. s组合训练(7)一、单项选择1. Please tell me how the accident , I‟m still in the dark.A. come byB. came uponC. came toD. came about2. –Did anyone support you at the meeting?–Mike was the only person who my opinion.A. agreedB. caredC. sharedD. accepted3. –It was careless of you to have left your clothes outside all night.–My God!A. So did IB. So I didC. So were youD. So did you4. – Linda, what are you thinking about?–Oh, I‟m considering .A. going abroadB. to go abroadC. going to abroadD. to go to abroad5. – What do you know about Yichang city?–Yichang city is the west of Hubei.A. atB. onC. toD. in6. –How long will you stay in England?–I‟m afraid I‟ll for quite a long time.A. leaveB. be leavingC. be away C. be going7. – Can you come and give us a talk on Tuesday or Friday?– I‟m afraid day is possible.A. bothB. eitherC. neitherD. all8. Can you believe that in a rich country there should be many poor people?A. such, suchB. such, soC. so, soD. so, such9.The suit fitted him well the color was a little brighter.A. expect forB. except thatC. exceptD. besides10. A number of students playing on the playground but I don‟t know what the exactnumber .A. is, isB. are ,areC. is, areD. are, is11. I work in a business almost everyone is waiting for a great chance.A. howB. whichC. whereD. that12. The women‟s football match a draw (平局) yesterday.A. endedB. ended inC. ended onD. ended by13. －That‟s a lo vely dress.－Do you think so? But I don’t the color.A. interest inB. care forC. please withD. fond of14. Each of the two boys wanted to get the toy and fought until one .A. give upB. gave inC. gave backD. gave off15. The doctor advised my mother to live the air is fresher.A. in whereB. in whichC. the place whereD. where二、阅读理解I met him first on a summer morning in 1936. I had rushed into his ugly little shop to 1 the heels (后跟) of my shoes repaired. It wasn‟t much of a 2 , so I waited while he did it. He greeted me with a cheerful smile, “You‟re new in this neighborhood, aren‟t you?”I said I was. I had 3 into a house at he end of the street only a week 4 .“This is a fine 5 ,” he said, “You‟ll be happy here.”I sat there with my shoes off, watching as he 6 ready to do the repairs. Sadly he looked at the leather (皮) covering on the 7 . It was worn out. I grew impatient because I was rushing to meet a friend. “Please hurry,” I 8 .He looked at me over his glasses. “Now, lady, we won‟t be 9 . I want to do a good job,”he was silent a moment, “You see, I have a tradition (传统) to live up to.”A 10 ? In this ugly little shop that was not different from so many others on the side streets of New York?He 11 have felt my surprise, for he smiled as he went on. “Yes, lady, my father and grandfather were 12 in Italy, and they were the best. My father always told me, …Son, do the 13 job on every shoe that comes into the shop, and be 14 of your fine work. Do that always, and you‟ll have 15 happiness and money to live on.‟”( ) 1. A. put B. make C. have D. order( ) 2. A. work B. job C. thing D. matter( ) 3. A. lived B. got C. stayed D. moved( ) 4. A. ago B. before C. since D. early( ) 5. A. neighborhood B. country C. shop D. house( ) 6. A. made B. took C. got D. had( ) 7. A. heel B. shoe C. back D. top( ) 8. A. ordered B. begged C. said D. expected( ) 9. A. late B. over C. long D. done( )10. A. job B. tradition C. moment D. shop( )11. A. couldn‟t B. should C. wouldn‟t D. must( )12. A. businessmen B. shoemakers C. both D. shopkeepers( )13. A. most B. first C. best D. last( )14. A. proud B. kind C. good D. able( )15. A. both B. all C. much D. most。
一年级下册语文作业7 怎么都快乐
基础知识过关
1．下象棋得( d)ě有两个人才行。 i
2．小明跑得( d)e可真快呀！
3．我今天的作业得( dé)了一百分。
讲 讲话
很 很好 许 许多
( 跳)绳 ( 下)象棋 ( 搭)积木
( )足球 踢 ( )音乐 听
( )排打球
关键素养提升
1．一个人正好可以____折__纸____。 2．我和小明一起__打__羽___毛__球___。 3．____大__家__一___起__玩_____很快乐。
一个人玩：___①__③___④____ 三个人玩：_____⑩_______
两个人玩：_______⑥__⑦__⑧__ 多个人玩：_______②__⑤___⑨_
1．在括号里填上合适的量词。
一( )长根绳 一( )蝴蝶只 一( )花样 个
2ቤተ መጻሕፍቲ ባይዱ照样子，写句子。 例：我像蝴蝶在绳子中翩翩起舞。
_____风__筝_像________老__鹰___一__样__在__天___空__中__翱__翔___。
我知道：2008年奥运会是在___北__京___举行的，2016年奥运会是在___巴__西__举
行的。
课时作业：7_4 重力势能(原卷版)
7.4 重力势能(原卷版)一、单选题（本大题共15小题）1.下列关于重力势能的说法中正确的是()A. 重力势能是物体独有的B. 重力势能的变化只跟重力做功有关系，和其他力做功无关C. 重力势能是矢量，在地球表面以下为负D. 重力势能的增量等于重力对物体做的功2.关于重力做功和重力势能，下列说法正确的是()A. 当物体克服重力做功时，物体的重力势能一定减小B. 一个物体的重力势能从−5J变化到−3J，重力势能减少了C. 当物体克服重力做功时，物体的重力势能一定增加，动能不一定减小D. 重力势能为负值说明其方向与规定的正方向相反3.下列说法正确的是()A. 在地面上的物体，它具有的重力势能一定等于零B. 从同一高度将某一物体以不同的速率分别竖直上抛和平抛，则物体从抛出到落地的过程中，重力势能的变化是相同的C. 一物体从楼顶落到地面，若受到空气阻力的作用，则物体重力势能的减小量小于自由下落时重力势能的减小量D. 重力做功时，除了与物体运动的高度差有关，还与物体的运动性质有关4.关于重力做功、重力势能，下列说法正确的是()A. 重力做功与物体运动的路径有关B. 重力势能的大小有相对性，大小与参考面的选取无关C. 重力势能的变化与参考面的选取有关D. 重力做功的多少可以衡量重力势能的变化5.质量为0.5kg的小球，从桌面以上h1=0.4m的A点落到地面的B点，桌面高h2=0.8m.以桌面为参考平面，g取10m/s2，下列说法正确的是()A. 小球在A点的重力势能为6JB. 小球在B点的重力势能为4JC. 小球从A点下落到B点的过程中重力势能减少了6JD. 小球从A点下落到B点的过程中重力做的功为−6J6.物体做自由落体运动，E p表示重力势能，h表示下落的距离，以水平地面为零势能面，如图所示图像中能正确反映E p和h之间关系的是()A. B.C. D.7.如图所示，物体从A点出发，沿着3条不同的轨道运动到B点，则移动过程中重力做功的情况是()A. 沿路径Ⅰ运动，重力做功最多B. 沿路径Ⅱ运动，重力做功最多C. 沿路径Ⅲ运动，重力做功最多D. 沿各条路径重力做功都一样多8.物体1的重力势能E p1=3J，物体2的重力势能E p2=−3J，则()A. E p1=Ep2B. E p1>E p2C. E p1<E p2D. 无法判断9.物体在运动过程中克服重力做功100J，则以下说法正确的是A. 物体的高度一定降低了B. 物体的高度可能不变C. 物体的重力势能一定是100JD. 物体的重力势能一定增加100J10.如图所示，ACP和BDP是竖直平面内两个半径不同的半圆形光滑轨道，A、P、B三点位于同一水平面上，C和D分别为两轨道的最低点，将两个质量相同的小球分别从A和B两处同时无初速释放，则()A. 沿BDP光滑轨道运动的小球的重力势能永远为正值B. 两小球刚开始从A和B两处无初速释放时，重力势能相等C. 两小球到达C点和D点时，重力势能相等D. 两小球到达C点和D点时，重力做功相等11.一个100g的球从1.8m的高处落到一个水平板上又弹回到1.25m的高度，则整个过程中重力对球所做的功及球的重力势能的变化是(g=10m/s2)()A. 重力做功为1.8JB. 重力做了0.55J的负功C. 物体的重力势能一定减少0.55JD. 物体的重力势能一定增加1.25J12.如图所示，桌子放于水平地面上，桌面高为h2.一质量为m的小球处于桌面上方h1高处的a 点.若以桌面为参考平面，重力加速度为g，小球从a点下落到地面上的c点，下列说法正确的是()A. 小球在a点的重力势能为mg(h1+h2)B. 小球在桌面b处的重力势能为mgh2C. 小球从a点下落至c点的过程中，重力势能减少mg(h1+h2)D. 小球从a点下落至c点的过程中，重力势能减少mgh113.如图所示，桌面高为h，质量为m的小球从离桌面高H处自由落下，不计空气阻力，假设以桌面处为参考平面，则小球落到地面时瞬间的重力势能和整个过程中重力势能变化分别为()A. mgh，减少mg(H−h)B. mgh，增加mg(H+h)C. −mgh，增加mg(H−h)D. −mgh，减少mg(H+h)14.质量为m的物体，由静止开始下落，由于恒定的空气阻力，下落的加速度为4g/5，在物体下落h的过程中，下列说法不正确的是()A. 物体动能增加了4mgh/5B. 物体克服阻力所做的功为mgh/5C. 物体的机械能减少了4mgh/5D. 物体的重力势能减少了mgh15.如图所示，一根绳的两端分别固定在两座猴山的A、B处，A、B两点水平距离为16m，竖直距离为2m，A、B间绳长为20m。
南京市高二物理寒假作业(含答案) (7)
南京市高二物理寒假作业07一、单选题（本大题共9小题，共36.0分）1.迄今为止，科学实验发现的最小电荷量就是电子所带的电荷量，人们把这个最小的电荷量叫做元电荷。
下列科学家中，最早测得元电荷数值的是（）A. 库仑B. 奥斯特C. 密立根D. 安培2.如图所示，一根通电直导线垂直放在磁感应强度大小为B、方向竖直向下的匀强磁场中，在以导线截面的中心O为圆心的圆周上有a、b、cd四点，已知a点的磁感应强度为2B，方向也是竖直向下，则d点的磁感应强度的大小和方向分别为（）A. 大小为B，方向竖直向上B. 大小为2B．方向水平向右C. 大小为B，方向垂直纸面向外D. 大小为B，方向斜向右下方3.在如图所示的电路中，某同学根据闭合开关K时，电流表示数的变化情况，来判断电源有无内阻。
下列是他对实验结果的判断，其中正确的是（）A. 若电流表示数不变，则电源有内阻B. 若电流表示数不变，则电源无内阻C. 若电流表示数变大，则电源有内阻D. 不能通过该实验判断电源是否有内阻4.已知只在A、B之间的空间区域内存在有静电场，电场线平行于x轴，电场中电势φ沿x轴方向的分布如图所示，一带正电粒子从A点由静止释放，仅在电场力作用下沿x轴运动，则以下分析正确的是（）A. 粒子恰好能到达B位置再返回B. 粒子在到达B位置前就开始向A点返回C. 粒子到达B点后继续向右运动不再返回D. 条件不足，无法判断粒子能否到达B点5.如图所示，圆形区域内有垂直纸面向里的匀强磁场，质子和a粒子（氦原子核）先后以相同的动能对准圆心O射入磁场，若粒子只受磁场力的作用，已知质子在磁场中偏转的角度为90°，则α粒子在磁场中偏转的角度是（）A. 30°B. 45°C. 90°D. 120°6.如图所示，电源电动势E=10V，内阻不计，R1=1.0Ω，R2=4.0Ω，R3=5.0Ω，C1=C2=30μF，先闭合开关S，待电路稳定后，再将S断开，则从S断开到电路再次稳定的过程中，通过R2的电荷量为（）A. 1.2×10-4CB. 1.5×10-4CC. 1.8×10-4CD. 30×10-4C7.如图所示，两条平行的光滑金属导轨间距为10cm，导轨平面与水平面夹角为45°，上端连接的定值电阻阻值为19，电源电动势为3V（内阻不计），质量为12g的导体棒ab放在金属导轨上，且与导轨垂直。
第7周数学周末作业
第7周数学周末作业班级姓名完成情况本周学习情况介绍：本周学习了第四单元表内除法（二），主要内容有：用7、8、9的乘法口诀求商和解决问题。
用乘法口诀求商是数学计算中一块重要的基石，它在整个计算领域中起着举足轻重的作用。
在实际教学中，同学们都学得比较轻松，知识掌握较牢固，但有个别同学口诀不能做到滚瓜烂熟，因此影响计算速度，希望这些同学多努力，把口诀记牢固。
解决问题有两个方面：一是学习“求一个数是另一个数的几倍”的用数学。
二是涉及乘、除两步计算的解决问题。
这是本学期的重点和难点，需要多练，在理解的基础上解决实际问题。
一、口算。
8×7＝ 40÷5＝ 5×6＝ 45÷9＝ 56÷7＝28÷4＝ 49÷7＝ 64÷8＝ 81÷9＝ 72÷8＝45－9＝ 8÷8＝ 4×9＝ 24÷8＝ 21+3＝14÷7＝ 8×2＝ 7÷1＝ 18+9＝ 6×6＝35÷5＝ 16÷2＝ 9÷9＝ 7×7＝ 48÷8＝二、填空。
（1）45÷9＝5表示把（）平均分成（）份，每份是（）；还表示（）里有（）个9；也表示45是（）的（）倍．（2）8×6＝48表示（）个（）相加得48；还表示8的（）倍是48．（3）8的2倍是（），8是2的（）倍．（4）两个因数都是7，积是（）；被除数和除数同样多，商是（）．（5）（）羊的只数是（）羊的（）倍。
（6）用8、9、72三个数列出4道算式。
（）×（）＝（）（）×（）＝（）（）÷（）＝（）（）÷（）＝（）三、列式计算。
1、把63平均分成7份，每份是多少？2、32里面有几个8？3、9的3倍是多少？4、9是3的几倍？5、被除数是21，除数是3，商是多少？6、被除数和除数都是8，商是多少？四、解决问题。
小学语文练习作业7
填关联词语并造句：革命先烈（）敌人毒刑拷打，（）吐露党的机密。
填关联词语并造句：革命先烈（）敌人毒刑拷打，（）吐露党的机密。
判断题：《秋天的怀念》、《花边饺子的爱》以及《为了五美元的礼物》都是写伟大的母爱。（）
理想的书籍是智慧的钥匙。——托尔斯泰
改把句子写具体：早晨的雾可真大啊，_________________________________
把句子改写成用感叹号表达的句子：西蒙死得很惨。
指出句子用了什么修辞手法：我的房间只有巴掌那么大。（）
缩句：敦煌莫高窟是一座举世闻名的艺术宝库。
作品中不属于四大悲剧的是（）A、《哈姆雷特》B、《李尔王》C、《悲惨世界》D、《奥赛罗》
小学
六年级语文题姓名：评分：
“夜空中撒满了快活地眨着眼睛的星星。”这句运用的修辞手法是（）A．拟人B．比喻C．排比D．夸张
写出结构相似的四字词语或成语东张西望：
把句子改写成肯定句：我暗暗叮嘱自己，这两天非要给他们姐弟俩买到两张电影票不可。
改写成用感叹号表达的句子：西蒙死得很惨。
C语言第7次作业
C语⾔第7次作业单选题：1、若要求在if后⼀对圆括号中表⽰a不等于0的关系,则能正确表⽰这⼀关系的表达式为________。
A.a < > 0B.!aC.a=0D.a!=0学⽣答案: C参考答案: D2、若变量都已经说明,则以下程序段输出为( )a=10;b=50;c=30;if (a > b) a=b; b=c;c=a;printf("a=%db=%dc=%d\n",a,b,c);A.a=10 b=50 c=10B.a=10 b=30 c=10C.a=50 b=30 c=10D.a=50 b=30 c=50学⽣答案: C参考答案: B3、以下程序的输出结果是main(){ int a= -1，b=1；if((++a < 0)&& ! (b-- < =0))printf("%d %d\n"，a，b)；elseprintf("%d %d\n"，b，a)；}A.-1 1B.0 1C.1 0D.0 0学⽣答案: B参考答案: C{ int a,b,s;scanf("%d%d",&a,&b);s=a;if (a < b) s=b;s=s*s;printf("%d\n",s);}A.14B.16C.18D.20学⽣答案: C参考答案: B5、下⾯的程序是______main(){ int x=3,y=0,z=0;if (x==y+z) printf("****");else printf("####");}A.有语法错误不能过通过编译B.输出****C.可能通过编译，但是不能通过连接，因⽽不能运⾏D.输出####学⽣答案: C参考答案: D6、请读程序:main(){ float x,y;scanf("%f",&x);if(x < 0.0) y=0.0else if((x < 5.0)&&(x!=2.0))y=1.0/(x+2.0);else if( x < 10.0) y=1.0/x;}若运⾏时从键盘上输⼊2.0(表⽰回车),则上⾯程序的输出结果是A.0.000000B.0.250000C.0.500000D.1.000000学⽣答案: B参考答案: C7、执⾏下⾯语句后的输出为( )int i= -1;if (i < =0)printf("****\n")else printf("%%%%\n")A.****B.%%%%C.%%%%CD.有语法错，不能执⾏学⽣答案: B参考答案: D8、在执⾏以下程序时，为了使输出结果为t=4,则给a和b输⼊的值应满⾜的条件是main( ){ int s，t，a，b;scanf("%d，%d"，&a，&b);s=1;t=1;if(a < 0)s=s+1;if(a > b)t=s+1;else if(a= =b)t=5;else t=2*s;printf("t=%d\n"，t);}A.0 > a > bB.a=0 < b参考答案: D9、下列语句正确的是( )A.if(a > b > c) temp=aB.if((a=b) > 0) temp=aC.int a=b=c=4D.int a;scanf(%d,a)学⽣答案: C参考答案: B10、与 y=(x > 0?1:x < 0?-1:0);的功能相同的if语句是A.if(x > 0) y=1; else if(x < 0) y=-1; else y=0;B.if(x) if(x > 0) y=1; else if(x < 0) y=-1; else y=0;C.y=-1 if(x) y=1; else if(x==0) y=0; else y=-1;D.y=0 if(x > -0) if(x > 0) y=1; else y=-1;学⽣答案: B参考答案: A11、有如下程序main0{ int x=1,a=0,b=0;switch(x){case 0: b++;case 1: a++case 2: a++;b++}printf("a=%d,b=%d\n",a,b);}该程序的输出结果是A.a=2,b=1B.a=1,b=1C.a=1,b=0D.a=2,b=2学⽣答案: B参考答案: Aif(x < 0.0) y=0.0;else if(x < 10.0) y=1.0/x; else y=1.0;printf("%f\n",y);}该程序的输出结果是A.0.000000B.0.250000C.0.500000D.1.000000学⽣答案: C参考答案: C13、有如下程序main(){ int a=2,b=-1,c=2;if(a < b)if(b<0) c=0;else c++printf("%d\n",c);}该程序的输出结果是A.0B.1C.2D.3学⽣答案: C参考答案: C14、若a、 b、c1、c2、x、y、均是整型变量，正确的switch语句是A.switch(a+b); {case 1:y=a+b;break; case 0:y=a-b;break; case3:y=b-a,break; }B.switch(a*a+b*b) {case 3: case 1:y=a+b;break; }C.switch a {case c1:y=a-b;break; case c2:y=a*d;break; default:x=a+b; }D.switch(a-b) {default:y=a*b;break; case 4:x=a+b;break; case15、已知 int x=10,y=20,z=30;以下语句执⾏后x,y,z的值是if(x>y)z=x;x=y;y=z;A.x=10,y=20,z=30B.x=20,y=30,z=30C.x=20,y=30,z=10D.x=20,y=30,z=20学⽣答案: C参考答案: B16、请阅读以下程序：main( ){int a=5,b=0,c=0;if(a==b+c) printf("***\n");else printf("$$$\n");}以上程序A.有语法错不能通过编译B.可以通过编译但不能通过连接C.输出***D.输出$$$学⽣答案: B参考答案: D17、读下列程序：#includemain(){float a，b，t；scanf(”％f，％f”，&a，＆b)；if(a>b){t=a；}prinff(”％5.2f，％5.2f'’，a，b)；}运⾏时从键盘输⼊3.8和-3.4，则正确的输出结果是( )。
7 1作业是指什么作业
内容介绍
3、临时用电作业 正式挖土、打桩、钻探、坑探、地锚入土深度在0.5 m以上；使用推土机、压路机等施工机械进行填 土或平整场地等可能对地下隐蔽设施产生影响的作业。
参考资料：动火作业
动火作业是指在禁火区进行焊接与切割作业及在易燃易爆场所使用喷灯、电钻、砂轮等进行可能 产生火焰、火花和炽热表面的临时性作业。
参考资料：标准作业顺序
作业顺序是指作业者能够效率最好地生产合格品的生产作业顺序。它是实现高效率的重要保证。 标准作业顺序是用来指示多技能作业员在同时操作多台不同机床时所应遵循的作业顺序，即作业 人员拿取材料、上机加工、加工结束后取下，及再传给另一台机床的顺序。这种顺序在作业员所 操作的各种机床上连续地遵循着。因为所有的作业人员都必须在标准周期时间内完成自己所承担 的全部作业，所以在同一个生产单元内在制品或生线上能够达成生产的平衡。 在编制标准作业顺序时，要设法避免产生浪费、不均等现象，必须把握现状，加以详细区分，例 如手的作业、脚的移动、工作方式，都须正确无误，并经常加以修正改善。
5、盲板抽堵作业 是指在设备抢修、检修及设备开停工过程中，设备、管道内可能存有物料（气、液、固态）及一 定温度、压力情况时的盲板抽堵，或设备、管道内物料经吹扫、置换、清洗后的盲板抽堵。
6、吊装作业 利用各种吊装机具将设备、工件、器具、材料等吊起，使其发生位置变化的作业过程。
内容介绍
7、高处作业 高处作业是指在距离坠落高度基准面2米以上（含2米），有坠落可能的位置进行的作业，包括上 下攀爬等空中移动过程。