A.分布筋 B.箍筋 C.架立筋 D.受力筋
A.HPB235 B.HPB300 C.HRB335 D.HRB400
A.1 B.2 C.3 D.4
A.20mm和d B.25mm和d C.25mm和1.5d D.30mm和1.5d