The causes of using traditional wet drilling difficultly are analysed. And the wet drilling method of the coal electric drill of external spray hydroelectric interlock is related.

分析了传统湿式打眼难以推广应用的原因，叙述了外喷雾水电联锁煤电钻湿式打眼法。

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I know that we should find a wet towel and find a way out when there is a fire. But I never participated in a drill.

我知道起火的时候，我们应该找一条湿毛巾，找出路。但是我从没有参加过演练。

youdao

I know that we should find a wet towel and find a way out when there is a fire. But I never participated in a drill.

我知道起火的时候，我们应该找一条湿毛巾，找出路。但是我从没有参加过演练。

youdao