There can be one, two or three joints of casing used for this purpose.
为满足这一目的，可能需要放置一根、二根或者三根浮动接头。
准备下套管。
The taper mill tap is a special tool for opening up a passage in casing.
锥形铣锥是用来套管打通道的专用工具。
We are setting up a mill for production of tubing and casing couplings.
我公司新上接箍项目，主要生产石油套管接箍和油管接箍。
A charging seat for a telephone set comprises a casing body and a cover body.
一种电话机充电座，包括一壳体与一盖体。
The casing is made by fireproofing plastic and is good for environmental protection.
外壳使用放火阻燃塑料制成，有益环保；
The casing is made by fireproofing plastic and is good for environmental protection.
外壳使用放火阻燃塑料制成，有益环保；
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