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。
Determining the diameter of drainage pipe is an important work in city planning course.
确定管径是给排水规划的一项重要内容。
Urban drainage pipe network is important establishment of a city.
城市排水管网是城市的重要基础设施。
Urban drainage pipe network is important establishment of a city.
城市排水管网是城市的重要基础设施。
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