May also serve as the seal negative pressure drainage the negative pressure source.
亦可用作封闭负压引流的负压源。
The regions adaptive to "non-negative pressure" pressure water supply device were analyzed, and the inadaptable regions with insufficient water source for water supply capacity were presented.
对无负压供水技术进行了分析，指出了设计或使用不合理时可能出现的问题；提出了正确使用无负压供水技术的工程措施。
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