垂直套管式埋地换热器 Vertical concentric tube ground heat exchanger
套管矫直器 Mandrel Socket
正方型法兰式直线套管 LMKC
直连型套管量规 XCSG
温度计套管直线度 [轻] porpendicularity of thermowell
硅橡胶直插式气管套管 silicone rubber straight tracheal cannula
直流套管 dc bushing
卡套式直角管接头 union elbow-assembly
卡套式直通管接头 union-assembly
简要介绍了直缝焊套管国内外使用情况，生产技术以及国内外生产现状，目前正在进行的一些试验研究工作。
It is introduced in brief that the domestic and foreign employed situation of straight welded casing, manufacture technology and production condition, and some researches being done at present.
对我国有关单位今后研究、生产、使用直缝焊接套管有参考作用。
It has reference role to the researches, manufacture and the usage of straight welded casing in our nation.
这就是水平井区别于直井，产生套管下入困难的直接原因。
This is the direct reason why the casing into the Horizontal Well is so difficult in the Horizontal Well.
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