The auxiliary shaft topsoil adopted ordinary construction and drainages in hygrometric well.
屯留煤矿副筒表土段采用普通法施工,利用水疏干水。
The auxiliary shaft topsoil adopted ordinary construction and drainages in hygrometric well.
屯留煤矿副筒表土段采用普通法施工,利用水疏干水。
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