昨天，他们用管输送油。
此外评述了用特征线方法进行水平管的数值模拟，倾斜管的压力降计算和长距离的栓流气力输送。
Numerical simulation using the methods of characteristics in a horizonal pipeline, the pressure drop in inclined pipeline, and the long distance plug-flow pneumatic conveying are reviewed.
对国外高压输送天然气管线用钢的技术条件，管线用焊管的生产工艺和生产特点作了论述。
The technical condition of steel used in high-pressure natural gas transmission pipeline and the productive technique and feature of the welded pipe used in the pipeline is discussed.
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