单项选择题
A.0.3 m B.0.5 m C.0.8 m D.1 m
A.±0.5mm B.±2.0mm C.±3.0mm D.±4.0mm
A.±1.0mm B.±2.0mm C.±3.0mm D.±4.0mm
A.10 mm B.20 mm C.25 mm D.30 mm
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