钻眼前，对电钻应该做的检查有（）。A、综合保护装置是否齐全、灵敏可靠 B、钎杆是否平直

发布时间：2018-02-14 10:13 │ 来源：www.tikuol.com

题型：多项选择题

问题：

钻眼前，对电钻应该做的检查有（）。

A、综合保护装置是否齐全、灵敏可靠

B、钎杆是否平直

C、电缆是否破皮、漏芯、漏电

D、螺丝螺帽是否紧固

E、钎头、钎尾是否合格

考点：矿用重型汽车司机矿用重型汽车司机综合练习矿用重型汽车司机综合练习题库

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一列沿x轴正方向传播的简谐横波，在t=0时的波形如图所示，质点A和C处于平衡位置，质点B处于波峰位置．已知该波周期为4s，则（　　）

A．质点A此时振动速度为零

B．质点B此时振动速度不为零且方向向下

C．t=2s时，质点C向下运动

D．t=2s时，质点A到达x=2m处

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The Water Cube is one of ______ sights in Beijing.[ ]

A. beautiful

B. more beautiful

C. most beautiful

D. the most beautiful

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完形填空。
One day I visited an art museum while waiting for my husband to finish a business meeting. I was expecting a quiet 1 of the splendid artwork. A young 2 viewing the paintings ahead of me 3 nonstop between themselves. I watched them a moment and decided the lady was doing all the talking. I admired the man's 4 for putting up with her 5 stream of words. 6 by their noise, I moved on. I met them several times as I moved 7 the various rooms of art. Each time I heard her continuous flow of words, I moved away 8 . I was standing at the counter of the museum gift shop making a 9 when the couple approached the 10 . Before they left, the man 11 into his pocket and pulled out a white object. He 12 it into a long stick and then 13 his way into the coatroom to get his wife's jacket. "He's a 14 man," the clerk at the counter said. "Most of us would give up if we were blinded at such a young age. During his recovery, he made a promise his life wouldn't change. So, as before, he and his wife come in 15 there is a new art show." "But what does he get out of the art?" I asked. "He can't see." "Can't see! You're 16 . He sees a lot. More than you and I do," the clerk said. "His wife 17 each painting so he can see it in his head." I learned something about patience, 18 and love that day. I saw the patience of a young wife describing paintings to a person without 19 and the courage of a husband who would not 20 blindness to change his life. And I saw the love shared by two people as I watched this couple walk away, their arms intertwined (交缠).
( )1. A. touch ( )2. A. lady ( )3. A. chatted ( )4. A. attempt ( )5. A. vivid ( )6. A. Adopted ( )7. A. through ( )8. A. anxiously ( )9. A. comment ( )10. A. entrance ( )11. A. plugged ( )12. A. made ( )13. A. led ( )14. A. brave ( )15. A. wherever ( )16. A. wrong ( )17. A. describes ( )18. A. kindness ( )19. A. support ( )20. A. get	B. view B. man B. argued B. independence B. constant B. Adapted B. to B. urgently B. decision B. exit B. held B. lengthened B. found B. rough B. whatever B. silly B. draws B. pride B. sight B. hope	C. wander C. couple C. screamed C. wisdom C. casual C. Conducted C. towards C. quickly C. purchase C. front C. reached C. brought C. forced C. smart C. whichever C. equal C. shows C. enthusiasm C. expectation C. allow	D. stare D. clerk D. yelled D. patience D. vague D. Disturbed D. from D. sensibly D. profit D. queue D. bent D. broadened D. tapped D. generous D. whenever D. unique D. decorates D. courage D. confidence D. cause

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原型化把有争议的问题，通过实际检验来加以澄清，从而消除系统开发中固有的 ______。

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流量扬程法测泵效时，计算单位可以不统一。

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