The plunger consists of a solid spiral mandrel, tapered mandrel nose, and premium high-alloy dart.

该柱塞包括一个实心螺旋轴、锥形芯轴的机头和优质高合金活门。

youdao

The plunger consists of a solid spiral mandrel, tapered mandrel nose, and premium high-alloy dart.

该柱塞包括一个实心螺旋轴、锥形芯轴的机头和优质高合金活门。

youdao