单项选择题
A.300MM B.250MM C.350MM D.200MM
A.直径为6mm螺纹钢其布放间距是200mm B.直径为6mm圆钢其布放间距是200mm C.200条6号钢筋 D.6条200号钢筋
A.圆钢 B.螺纹钢 C.型钢 D.钢板