题目内容

加工方法不同所能达到的表面粗糙度不同。一般情况下,精加工所能达到的表面粗糙度的范围是()

A. Ra 6.3-12.5
B. Ra 6.3-1.6
C. Ra 0.8-0.2
D. Ra 0.1-0

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