单项选择题
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
A.5mm B.10mm C.20mm D.30mm
A.1mm B.1.5mm C.2mm D.2.5mm
微信扫一扫,加关注免费搜题