把一重为G的物体,用一个水平的推力F=kt(k为恒量,t为时间)压在竖直的足够高

发布时间：2017-06-25 23:26 │ 来源：www.tikuol.com

题型：选择题

问题：

把一重为G的物体,用一个水平的推力F=kt(k为恒量,t为时间)压在竖直的足够高的平整的墙上(图1-4-14).从t=0开始物体所受的摩擦力F_f随t的关系是图1-4-15中的( )

图1-4-14

图1-4-15

考点：滑动摩擦力、动摩擦因数

题型：选择题

产后5天，发热，右乳下方红，硬结

1个月后，患者左 * * 皲裂，疼痛，应做的处理是（）。

A.建议停止哺乳，回乳

B.给予止痛药物

C.先喂健侧 * * ，后喂患侧，喂毕在 * * 上涂一滴乳汁

D.患侧涂紫

E.患侧涂鱼石脂软膏

查看答案

题型：选择题

完形填空。

     There was a time when I thought my dad didn't know a thing about being a good father. I couldn't   1
him ever saying the words "I love you." It seems to me his only purpose in life was to say "  2  " to
anywhere I wanted to go and anything I wanted to do, including getting a   3 . Some parents bought their
kids cars when they got their driver's licenses. Not my dad -he said that I'd have to get a job and buy my
own.
     So that is what I did. I got a job at a very nice restaurant and    4   every penny I could and   5   I had
enough to buy my car, I did! The day I brought that car home, my dad was the first one I wanted to   6
to.   "Look, dad, a car of my own. If you ever want a ride, I'll only   7   you five dollars." I offered with a
smile.
    "I see," was all he said.
     One day, there was something wrong with my father's truck. So he needed a   8   to work. The sun
wasn't even up when we left the house ,   9   it was already getting warm out. It was going to be a(n)   10
day. As I dropped my dad off, I   11   him, dressed in his work clothes, getting his   12   from the truck
(车尾箱) of my car. Watching his sun-weathered face, and even from a distance I could tell there were
   13   lines than I ever remembered being there before. I realized how hard my dad works for the family.
My father is a cement finisher(水泥修整工).
      At that moment, it   14 to me that he actually got down on his hands and knees to sweat over hot
concrete(混凝土) to make a living for his family. And he did this day in and day out,   15 hot it got.
Never, not once, had I heard him   16   about it. To him we were "worth" it. And never once did he
"charge" us for it.
     When he closed the trunk, his tools set off to the side, he walked over to my window to   17   me
five dollars. I rolled down the window and said "Good-bye, dad. Keep your five dollars. It's my   18_ .
Don't work too hard. I love you."
     His   19   met mine, then glanced away in the direction of his waiting tools, he   20   his throat(喉咙,
嗓子) and said, "Oh, and…

( )1. A. like
( )2. A. Sorry
( )3. A. car
( )4. A. spent
( )5. A. when
( )6. A. pay it back
( )7. A. pay
( )8. A. ride
( )9. A. as
( )10. A. ordinary
( )11. A. helped
( )12. A. tools
( )13. A. fewer
( )14. A. happened
( )15. A. whatever
( )16. A. talk
( )17. A. hand
( )18. A. help
( )19. A. hands
( )20. A. cleaned

B. remember
B. Yes
B. friend
B. earned
B. if
B. hand it over
B. charge
B. leave
B. although
B. hot
B. followed
B. clothes
B. more
B. seemed
B. whenever
B. complain
B. bring
B. advice
B. smile
B. wiped

C. forget
C. No
C. job
C. kept
C. because
C. turn it up
C. offer
C. trip
C. but
C. work
C. left
C. luggage
C. longer
C. occurred
C. wherever
C. ask
C. lend
C. treat
C. voice
C. cleared

D. care
D. Well
D. present
D. saved
D. though
D. show it off
D. provide
D. hurry
D. since
D. special
D. watched
D. bag
D. deeper
D. appeared
D. however
D. speak
D. take
D. reply
D. eyes
D. felt

查看答案

题型：选择题

规模化畜禽养殖场主要环境污染因子有哪些？

查看答案

题型：选择题

宪法实施监督的方式主要有（）

A、预防性审查

B、事后审查

C、个案审查

D、宪法控诉

查看答案

题型：选择题

35―110kV变电所，为检修电压互感器和避雷器而设置隔离开关的正确原则是（）。

A.接在母线上的电压互感器和避雷器，不可合用一组隔离开关；

B.接在母线上的电压互感器和避雷器，可合用一组隔离开关；

C.接在主变压器引出线上的避雷器，必须设置隔离开关；

D.接在主变压器引出线上的避雷器，不宜设置隔离开关。

查看答案

更多题库