deep well working barrel
... 矿井工程学硕士 master of 深井工作泵 deep well working barrel 天井工作面 raise face ...
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深井泵工作筒 deep well working barrel
以试验为手段，研究了深井泵在一定倾斜角度下的工作特性及球阀的运动规律。
Through the experiments, we have studied the working characteristics of the down-hole pump at different inclined angles and studied the moving pattern of ball valves.
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