单项选择题
A.10.5mm B.11.5mm C.12.15mm D.13.5mm
A.±1.5° B.±2.5° C.±3° D.±4°
A.0.3³0.3m B.0.4³0.4m C.0.5³0.5m D.0.6m³0.6m
A.15cm B.20cm C.25cm D.30cm
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