The method of design and calculation on in-line welding branch pipeline for gas transmission trunk line is introduced.

介绍了干线输气管道热连接分支管道的设计计算方法。

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It is very important to describe the performance curves of centrifugal compressor by mathematical model accurately for the automatization design and management of gas transmission trunk line.

对于输气干线的自动化设计和管理来说，用准确的数学模型描述离心压缩机的特性曲线至关重要。

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As there is something wrong with the trunk line of the network, the transmission of data is blocked. The technical staff is urgently repairing it.

由于网络的中继线出了问题，造成数据通信不畅，技术人员正在抢修。

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The underwater trunk transmission line carrying the power from the wind farms to shore has to be built.

FORBES: In A Bold Move, Massachusetts Stakes Out Its Role in US Offshore Wind Development