单项选择题
A.0.005mm B.0.010mm C.0.015mm D.0.02mm
A.5mm B.5.5mm C.10mm D.10.5mm
A.半周 B.一周 C.一周半 D.两周
A.0.625mm B.0.325mm C.0.425mm D.0.6mm
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