3: 天然气的节流过程是( )。 A: 绝热过程 B: 等焓过程 C: 等熵过程 D: 不可逆过程 ...
2: In the United States there was an unusual tale telling of the daughter of a mechanic. One day while walking along the bank of a lake, the girl happened to see 20 eggs laid by a wild goose. After some time the girl realized the mother wou...
2: When you take a walk in any of the cities in the West, you often see a lot of people walking dogs. It is still true that a dog is the most useful and faithful animal in the world, but the reason why people keep a dog has changed. ...
20. ― Excuse me, how can I get to the nearest subway station? ― ________________. A. It’s two blocks up this street. B. Yes. You are going the wrong way. C. Don’t talk about it. D. I need your help. ...
7.??在举升高粘度流体时,为了降低杆液之间的摩擦力,不能采用快速抽汲方式。 A. 错误 B. 正确 ...
3.??测量动液面的仪器称为回声仪,测量示功图的仪器称为动力仪。 A. 错误 B. 正确 ...
9.??油田注水工程是油田上( )最多的一个系统。 A. 节能 B. 耗能 C. 效益 D. 资产 ...
5.??( )泵径较大,适合用在产量高、油井浅、含砂多、气量小的井上。 A. 管式泵 B. 杆式泵 C. 电潜泵 D. 无杆泵 ...
1.??在注水系统的首端加入少量的能防止或( )结垢的化学药剂,称为防垢剂。 A. 清除 B. 减缓 C. 降低 D. 增加 ...
7.??油井流入动态是指油井产量与井口压力的关系,它反映了油藏向该井供油的能力。 A. 错误 B. 正确 ...