The auxiliary shaft topsoil adopted ordinary construction and drainages in hygrometric well.

屯留煤矿副井井筒表土段采用普通法施工,利用井外降水井疏干降水.

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Geological exploration projects are different from ordinary construction projects , especially on larger cost control difficulty.

地质勘查项目不同于一般建设项目, 成本控制难度较大.

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