The cast iron pipe is used for water supply, drainage and gas transmission pipeline.

铸铁管用于给水、排水和煤气输送管线，它包括铸铁直管和管件。

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One end of the gas supply pipeline is connected with the gas supply system;

送气管线的一头与供气系统连接；

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One end of the gas supply pipeline is connected with the gas supply system;

送气管线的一头与供气系统连接；

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