A.45sB.10sC.20sD.40s
A.30B.35C.25D.20
A.等于對(duì)重的寬度 B.不小于對(duì)重的寬度兩邊各加50mm C.大于對(duì)重寬度兩邊各加0.10m D.至少等于對(duì)重寬度兩邊各加0.10m