钻井液中大部分的粘土颗粒带负电荷。
参考答案：对
----Shall I go and buy two more bottles of beer?
----No, I’ve already bought them yesterday. That be enough for us two.
A．can
B．may
C．should
D．might
根据耦合电容器检修策略，相间温差应不大于（）。
A.1K
B.2K
C.3K
D.4K
