单项选择题
A.0.2mm B.0.5mm C.0.3mm D.0.1mm
A.12;0.2 B.12;0.1 C.13;0.2 D.13;0.1
A.12;0.1 B.12;0.2 C.13;0.2 D.14;0.1
A.1mm B.5mm C.2mm D.4mm
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