Waste draining pipe, offlet or drain pipe should be connected to the main pipe;each pipe should connect two valves with the most possible short valve-to-valve pipe length.
排、水或疏水应分别连各自的总上,每均应串阀门,阀门间的段应尽量缩短。
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Recycled plastic is already used to make some products, such as guttering and sewage pipes.
回收塑料已被用于作一些产品,比如排排污管。
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