A.1/4~1B.1/2~1C.1/5~1D.1/10~1/2
A.尺寸效應(yīng) B.重力效應(yīng) C.鞭梢效應(yīng) D.形狀效應(yīng)
A.屋面板 B.吊車梁 C.屋架 D.偏心受壓柱