artificial drainage system
... 人工搅拌 hand mixing 人工排水系统 artificial drainage system 人工铺砌的 handplaced ...
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目前国内各矿井的排水系统多采用传统的继电器控制方法，用人工进行监测。
At present, most drainage systems of all domestic coal mine well adopt conventional means of relay controlling, inspected artificially.
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