城里甚至还敷设了排水系统，因为在狭窄的街道底下发现了许许多多陶土制作的排水管道。
The city was equipped with a drainage system, for a great many clay pipes were found beneath the narrow streets.
介绍了系统的布置方法及回水管的几种敷设形式。
Presents the arrangement method of this system and layout types of its return pipes.
该系统比较适合于旧供暖系统的改造。介绍了系统的布置方法及回水管的几种敷设形式。
This kind of system is suitable for reform of old systems. Presents the arrangement method of this system and layout types of its return pipes.
为了提高城市排水管道网络敷设的精确度和生产率，我们设计和研制了JGY-1型激光管道准直仪。
We have designed and have developed the JGY-1 type laser pipeline aligning instrument for rising the accuracy and the productivity of the construction of city drainage pipeline network.
为了提高城市排水管道网络敷设的精确度和生产率，我们设计和研制了JGY-1型激光管道准直仪。
We have designed and have developed the JGY-1 type laser pipeline aligning instrument for rising the accuracy and the productivity of the construction of city drainage pipeline network.
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