Lead and backup tong-men should not stand between the two pipe tongs while the driller is making up or breaking out pipe or collars.
当司钻正在上卸钻杆和钻铤时，内外钳工不要站在两个大钳之间。
An unsteady heat transfer model was sot up and solved by numerical solution for the heat transfer characteristic of U-pipe heat exchanger and the interaction of the two pipe legs of the GSHPs.
针对U型管埋地换热器的传热特点，考虑了两管脚之间的相互影响，建立起非稳态传热模型。
An unsteady heat transfer model was sot up and solved by numerical solution for the heat transfer characteristic of U-pipe heat exchanger and the interaction of the two pipe legs of the GSHPs.
针对U型管埋地换热器的传热特点，考虑了两管脚之间的相互影响，建立起非稳态传热模型。
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