题目内容

任何油气层均可进行欠平衡钻井。

A. 正确
B. 错误

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In a domestic fresh water system, the pump starters are controlled by （） switches which operate when the pressure in the tank varies within predetermined limits as water is drawn off.

A. water level
B. water flow
C. temperature
D. pressure

哪些动物可以感染高致病性禽流感？

抽油机每个地脚螺栓旁对应放置（）垫铁。

A. 一组
B. 两组
C. 三组
D. 四组

确定组数多少和组距大小的原则是？