塑胶外壳不能有永久性变形，电气部件的间隔也能符合第3.11条的标准。
There shall be no permanent deformation of the polymeric housing, and electrical spacings shall comply with Dlause3.11.
有时张紧行程不够，皮带出现永久性变形，这时可将皮带截去一段重新进行硫化。
Sometimes the tensioning stroke is not enough, the belt of permanent deformation, then can be the belt off a section to cure.
结构合理，能均衡考虑车架的强度、刚度、韧性，具有承载能力强，不发生永久性变形等特点。
The structure is designed reasonably to get a balanced consideration of the intensity, rigidity and toughness of the frame, having the merits of large capacity and no permanent distortion.
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