... down-hand welding ==> 俯焊 down-hole pump ==> 井下泵,井下泵 down-payment ==> 分期付款的首笔付款 ...
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Petroleum down-hole pump 石油潜孔泵
Down-hole twin-screw pump 井下双螺杆泵
down hole progressing cavity pump 井下螺杆泵
·2,447,543篇论文数据，部分数据来源于NoteExpress
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.
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。
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