push jack
... push feed drill 推进式凿岩机 push jack 推动千斤顶 push loading 推压装载 ...
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螺旋千斤顶：采用螺杆或由螺杆推动的升降套筒作为刚性顶举件的千斤顶。
Screw jack: Uses the screw rod or the fluctuation sleeve which impels by the screw rod goes against as the rigidity lifts a hoisting jack.
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