单项选择题
A.±1.0mm B.±2.0mm C.±3.0mm D.±5.0mm
A.HRC28-32 B.HRC30-34 C.HRC32-36 D.HRC34-38
A.20m B.24m C.30m D.40m
A.-15mm和+15mm B.-15mm和+30mm C.0mm和+15mm D.0mm和+30mm
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