Yet if the assurancecoefficient is too big, it will happen that material's uneconomic use and hook's ponderosity.
而安全系数过大,又造成制作材料的浪费和吊钩的粗笨。
2
The select of assurancecoefficient is a problem that is often met in mechanical design. How to reasonably select it is a basic subject.
安全系数的选取是机械设计中普遍遇到的问题,合理选取安全系数是机械设计中的一项基本课题。
3
The roof management, roof pressure computing, assurancecoefficient checking are introduced. Three kinds of protecting methods of working face management are expounded.