The water proof gate is the main safety facility against underground water to the coal mine threatened by water disaster.
对于受水害威胁的矿井,防水闸墙是井下防水的主要安全设施。
The water proof gate is the main safety facility against underground water to the coal mine threatened by water disaster.
对于受水害威胁的矿井,防水闸墙是井下防水的主要安全设施。
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