... 维修设施用通道：service access 维修坑：maintenance pit 维修记录册：maintenance log book ...
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basic pit maintenance 基坑围护
·2,447,543篇论文数据，部分数据来源于NoteExpress
As with so many collieries, the men were laid off and the pit was put on "care and maintenance" which meant keeping it free from noxious gases and seeping water so that it could be reopened if the industry picked up.
BBC: NEWS | UK | Watching the pits disappear
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