排水立管的上部和下部都存在正压和负压。
Positive and negative pressure existed in the upper and lower drainage pipes.
第三，判定排水立管通水能力的关键是根据系统内部压力波动造成水封破坏这一边界条件。
Thirdly, the key of determining the discharge caPacity of the drainage pipes was according to the boundary condition that the pressure fluctuations within the system caused seal damage.
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