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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.

、放水管或疏水管应分别连接各自的总管上,每管均应串接两,两间的管段应尽量缩短。

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Recycled plastic is already used to make some products, such as guttering and sewage pipes.

已被用于作一些产排水沟和排污管

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3G, 401(K), a,
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