Control lows drainage pipeline gas sources.

控制气源管线低位排水.

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Design experience of water supply and drainage pipeline project is introduced in the paper.

本文介绍了石油化工企业给水排水管道工程的设计经验.

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Have explained some views while laying for the drainage pipeline in the room.

阐述了室内给排水管道敷设时的一些观点.

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