表面粗糙度Ra的基本系列为0.012,0.025,0.050,0.100,0.200.....,单位为um,它们属于哪个系列?
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表面粗糙度Ra的基本系列为0.012,0.025,0.050,0.100,0.200.....,单位为um,它们属于哪个系列?
A.R10/3
B.R5
C.R10
D.R20
参考答案: