An optimization on designing the planar four-bar linkage which is liable to reappear the location of a definitepoint is recommended.
本文给出了能复演给定位置点的平面机构的优化设计方法。
2
Both characteristic quantity of safety grade and its variable are the value obtained from the fuzzy sub-set of safety grade on domain, and are not a definitepoint.
安全等级特征量及安全等级变量，均为安全等级取值论域上的模糊子集，而并非是一个确定的点。
3
This paper discusses the problems of doing work by the forces pointing at the definitepoint or vertically at the definite line or plane. And a calculating formula is given.