问题
多项选择题
能造成离心泵发生气缚的因素有（）
A.入口法兰漏
B.泵壳漏
C.出口阀漏
D.过滤器堵
答案
参考答案：A, B, D
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能造成离心泵发生气缚的因素有（）
A.入口法兰漏
B.泵壳漏
C.出口阀漏
D.过滤器堵
参考答案：A, B, D
| 完形填空。 | |||
| The sun is shinning and it's very hot. 1 many people don't want to go out after 2 . Mrs. West has to (不得不) 3 her father at the air-port. Her father doesn't feel well he wants to see a 4 in the city hospital. Now she's 5 in the street. There 6 no trees and she feels very 7 . But she's too 8 and can't walk fast (快). Suddenly she finds (发现) a 9 walking behind her. She gets angry (生气). "Why are you walking 10 me, boy?" She asks the boy. "It's cooler". The boy answers. | |||
| ( )1. A. But ( )2. A. breakfast ( )3. A. watch ( )4. A. nurse ( )5. A. walking ( )6. A. be ( )7. A. cold ( )8. A. happy ( )9. A. boy ( )10. A. on | B. Because B. dinner B. meet B. waiter B. lying B. is B. coo1 B. fat B. man B. in front of | C. So C. supper C. help C. policeman C. running C. are C. relaxed C. short C. woman C. behind | D. Then D. lunch D. ask D. doctor D. angry D. am D. hot D. tall D. dog D. across from |