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问题 问答题 简答题

井下探放水五项原则是什么？

答案

参考答案：

（1）先隔离后探放的原则

（2）先降压后探放的原则

（3）先封堵后探放的原则

（4）先探放后开采的原则

（5）有疑必探的原则

选择题

Mr. Zheng is such a __________ person that he has donated much money to the schools in his hometown.

A．selfish

B．patient

C．humorous

D．generous
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单项选择题

Are you going on holiday for a long time?（）

A.It was a long time.

B.Two weeks ago.

C.No. Only a couple of days.

D.Not long time ago.
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