单项选择题
A.1mm B.2mm C.3mm D.4mm E.5mm
A.0.1° B.0.5° C.1° D.2° E.5°
A.0.1mm B.0.2mm C.0.5mm D.1mm E.2mm
A.±1% B.±2% C.±3% D.±4% E.±5%
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