Open drainage should be performed for PA.
对于PA，应行脓肿切开引流。
Water drainage hose, charging valve shall be kept open.
为排出槽内和排水管中的水，应使排水阀保持开状态。
Water drainage in hollow open pit stope is a key link of production.
凹陷露天采场排水是一个十分重要的生产工艺环节。
Water drainage in hollow open pit stope is a key link of production.
凹陷露天采场排水是一个十分重要的生产工艺环节。
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