单项选择题
A.10.5mm B.13.5mm C.15.5mm D.20.5mm
A.大3~4mm B.大5~6mm C.小2~3mm D.小3~4mm
A.大于 B.小于 C.等于 D.大于或等于
A.1~2mm B.2~3mm C.2~5mm D.8~10mm
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