单项选择题
A.0.1mm B.0.2mm C.0.3mm D.0.4mm
A.2.0% B.2.5% C.3.0% D.3.5%
A.1.5% B.2.0% C.2.5% D.3.0%
A.10.0um B.11.0um C.12.0um D.13.0um
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