The workmen dug a trench for the new water pipe.
工人挖一条沟放新水管。
Hydrogen gas pipe can be arranged on pipe rank, direct bury or in open pipe trench.
氢气管道可采用架空, 直埋及明沟敷设。
The article mainly introduces the method of detecting the trench less metal pipe by magnetic gradient.
介绍了利用磁梯度探测非开挖金属管线的方法。
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