单项选择题
A.1mm B.1.5mm C.2mm D.2.5mm
A.1mm~2mm B.1mm~3mm C.1mm~4mm D.1mm~5mm
A.0.2mm B.0.3mm C.0.4mm D.0.5mm
A.0.5mm B.1mm C.1.5mm D.2mm
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