One is called the S-N curve of surface fracture mode. It is governed by a crystal slip on the specimen surface, which occurs in the region of short fatigue life and high stress amplitude level.
一组叫做表面破坏模式的S-N曲线，它发生在高应力幅短寿命区，是由试样表面晶体滑移引起的。
This paper has proved that a plane curve cis a circle if and only ifc is the locus of a moving point that has a constant second power average of distances from n fixed points.
本文提出了确定内燃机配气机构刚度的三种数据处理方法，并对处理结果作出了分析、比较，确认二次刚度平均法是一种较好的实用方法。
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