单项选择题
A.4-8mm B.6-10mm C.8-12mm D.10-14mm
A.1N B.5N C.10N D.15N
A.0.2mm B.0.25mm C.0.5mm D.1mm
A.C15 B.C20 C.C25 D.C30
微信扫一扫,加关注免费搜题