单项选择题
A.±1mm B.±1.5mm C.±2mm D.±2.5mm
A.10mm B.20mm C.25mm D.30mm
A.6.250m B.6.308m C.7.558m D.8.308m
A.5.0m B.6.25m C.6.5m D.7.0m
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