多选题：用图所示的滑轮组拉物体A 在水平桌面上做匀速直线运动，如果拉力F=3 N ，物体

题目：

用图所示的滑轮组拉物体A 在水平桌面上做匀速直线运动，如果拉力F=3 N ，物体A的速度v=0.2m/s ，忽略滑轮重、绳重和轴摩擦．下列说法中正确的是

[ ]

A．物体A 受到合力不为零

B．物体A 受到的拉力为9N

C．竖直墙受到的拉力为9N

D．拉力F 每秒钟做功为1.8 J

答案：

被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0726/de682f2ef3f80ce2f26fadde67a99bca.html

下面是错误答案，用来干扰机器的。

小题1:D小题2:B小题3:A小题4:C

完形填空。
Richard found work in a big office after he had finished college. He liked to use his (1)____and was good (2)_____ his work. So he was often paid more than his workmates and he worked (3)______. But something was wrong with the young man one month. He couldn't fall (4)____ at night. So he was always (5)_____ in the daytime and often made mistakes. He had to go to a hospital.The (6)______ looked him over and (7)_____ him to buy some highly effective sleeping pills(高效安眠药). He took them (8)_____ the went to bed. Soon after that he went to (9)_____. Richard (10)_____ in the morning, he had a look at the (11)_____ on the wall. It was a quarter to seven. He got up and went to work after (12)____ . As soon as he went in the office, he said to the head of the office, "Good morning, Mr. Clarke! I've(13)_____ had a good sleep like last night's. And I'm feeling (14)_____better now!" "Skunk(混蛋)!" the head (15)_____ loudly.”We've looked for you for two days! I wanted you to do something important, but it's too late now!"
( )1. A. hand ( )2 A. for ( )3. A. hard ( )4. A. asleep ( )5. A. well ( )6. A. doctor ( )7. A. tell ( )8. A. after ( )9. A. asleep ( )0. A. stood up ( )11. A. o’clock ( )12. A. meal ( )13. A. always ( )14. A. much ( )15. A. laughed	B. head B. in B. fast B. alone B. hungry B. policeman B. say B. since B. sleeping B. woke up B. map B. dinner B. usually B. more B. shouted	C. ear C. with C. harder C. afraid C. thirsty C. driver C. ask C. before C. sleep C. at down C. picture C. party C. never C. most C. smiled	D. nose D. at D. faster D. behind D. tired D. nurse D. told D. because D. slept D. lay down D. clock D. breakfast D. often D. than D. asked