A.10mm B.15mm C.20mm D.25mm
A.s≥30mm及s≥1.5d B.s≥50mm及s≥d C.s≥25mm及s≥d D.s≥25mm及s≥1.5d
A.等于箍筋間距 B.500mm~700mm C.300mm~500mm D.700mm~1000mm