A.按變形控制設(shè)計(jì) B.按強(qiáng)度要求設(shè)計(jì) C.都要滿足
A.<1.0 B.>1.0 C.<=1.0 D.>=1.0
A.0.5~1倍 B.1~2倍 C.2~3倍 D.3~4倍