单项选择题
A.0.01mm B.0.02mm C.0.03mm D.0.04mm
A.0.02mm B.0.2mm C.0.2cm D.0.02cm
A.±3% B.±30% C.±4% D.±40%
A.＞20mm B.＞200mm C.＞30mm D.＞300mm
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