单项选择题
A.1mmB.2mmC.3mmD.4mm
A.0.1mm,0.1mmB.0.1mm,0.3mmC.0.3mm,0.1mmD.0.3mm,0.3mm
A.1mB.2mC.3mD.4m
A.3N.mB.3.5N.mC.4N.mD.4.5N.m
微信扫一扫,加关注免费搜题