经济学

通常表现为零件原始尺寸的改变及形状的改变，公差配合性质的改变及精度下降，零部件损害等，称为

发布于 2021-03-19 19:42:36

【单选题】
A 第一类有形磨损
B 第二类有形磨损
C 经济无形磨损
D 技术无形磨损

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fengshan 2023-03-19

这家伙很懒，什么也没写！

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把气愤的心境转化为柔和，把柔和的心境转化为爱，如此，这个世间将更加完美。

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