单项选择题
A.0.5mm B.0.6mm C.0.75mm D.0.8mm
A.kg/m2 B.KN/m C.N/m2 D.N/m
A.1.5~3.5% B.4~5% C.5.5~7.5% D.8~9%
A.CF B.CB C.SC D.CFB
微信扫一扫,加关注免费搜题
