在这种情况下，必须确保顶杆复位的安全性。
In this case, the safety of the returning ejector should be ensured.
本文介绍了顶杆安全半径的计算和采用压缩弹簧使顶出杆复位的方法。
The article introduces the calculating method of the safety value of ejector radius and the returning way of the ejector with the compressive spring.
各种车型的汽车为确保安全，使用千斤顶时一般都有固定的位置，不能用千斤顶支在保险杆、横梁等部位。
All sorts of model car in order to ensure the safe, use jack when generally have fixed position, cannot use jack teams in insurance, beams in areas such as the pole.
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