单项选择题
A.0.05mm B.0.1mm C.0.2mm D.0.5mm
A.0.02% B.0.04% C.0.06% D.0.08%
A.0.1% B.0.15% C.0.2% D.0.5%
A.0.2% B.0.3% C.0.5 % D.1.0 %
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