A.20mm B.25mm C.30mm D.50mm
A.不小于25mm B.不小于l0mm C.不小于30mm D.不小于l5m
A.焊接 B.鋼筋套筒冷壓連接 C.鋼筋套筒錐螺紋連接 D.鋼筋直螺紋套筒連接