单项选择题
A.0.3mm B.0.4mm C.0.5mm D.0.6mm
A.2mm B.3mm C.4mm D.5mm
A.1.5±0.5mm B.2±0.5mm C.4±1.5mm D.8±3mm
A.0.5mm B.1mm C.2mm D.3mm
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