• 水封损失 - 引用次数：4

  With the increase in the number of draining, the loss of U-trap is getting smaller and smaller, until it stops changing.

  每一次放水存水弯水封损失随着连续放水次数的增加而减小,直到水封水位不再变化。

  参考来源 - 七层PVC

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