一般都装在起重臂的头部，当吊钩滑升到极限位置，便托起杠杆。

Are generally installed in the boom when the hook head, sliding to the limit position, then hold the lever.

youdao

一般都装在起重臂的头部，当吊钩滑升到极限位置，便托起杠杆。

Are generally installed in the boom when the hook head, sliding to the limit position, then hold the lever.

youdao