单项选择题
A.20 B.15 C.10 D.0.5
A.8 B.6 C.4 D.2
A.10 B.20 C.30 D.35
A.O.5d(d为钢筋直径) B.0.3d C.O.2d D.0.1d
微信扫一扫,加关注免费搜题