千斤顶

He jacked the car and changed the back tyre.

他用把车起来更换后胎。

Hydraulic jacks under the machine produce the movement.

是机器下面的液压造成的移。

This article introduced field assembly of large-scale towers adopting jack,the welding of the shell,heat treating and hydrostatical test.

介绍了大型塔器现场采用进行组对、焊接、热理、水压试验,同时对如何解决塔段出现椭圆变形超标的问题进行阐述。