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。
Make sure that the weight and flexible force of pipe do not act on pump directly while installing pipe.
安装管路时，必须使管路重量、弹性力等不得直接加在水泵上。
What is the drill pipe string weight in air?
钻杆在空气中的重量是多少？
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