However these troubles of concentrated urea liquor crystallizing and blocking pipe, as well as urea changing into biuret at high temperature should be avoided.

但在生产中要妥善解决尿素浓溶液易结晶堵塞管道以及尿素在高温下易生成缩二脲的问题。

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The underground pipeline is usually installed by top pipe method for the constructions on ground with concentrated railway and highway.

地面建构筑物．在铁路、公路密集条件下．顶管法铺设地下管道为最常见的施工方法。

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On the condition of a larger pipe inclination Angle, the distribution of liquid slug lengths was more concentrated in a smaller range.

在管线下倾角较大的情况下，液塞长度分布集中在较小的范围内。

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