扭转 △O △ △ 1MIMI TI v=W=M:△2G,2Gn=G M T2(x) X °2G/n(x)二、扭转 V = W    m m = Me  2 1 p p e p e e GI T l GI M l GI M l M 2 2 2 1 2 2 = = =  = l p x GI x T x V d 2 ( ) ( ) 2 