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Of a rotary vane vacuum pump, or a liquid ring vacuum pump.

其前级泵可用滑阀泵或旋片泵 、 水环泵、油环泵等真空泵.

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The operating principles, process and application of liquid - ring vacuum pump in crude - oil distillation unit were introduced.

介绍了液环真空泵工作原理 、 流程及应用情况.

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