As the hatch slowly closes, the weight rises inside a section of PVC pipe.
随着出口板缓慢合上，一截PV c管内的重量也增加。
What is the drill pipe string weight in air?
钻杆在空气中的重量是多少？
With the traditional electric pipe threader than light weight.
与传统的电动套丝机相比，重量轻。
With the traditional electric pipe threader than light weight.
与传统的电动套丝机相比，重量轻。
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