用隔离法列方程:(以逆时针方向为正) A10,B A MLL-SB B B Bg T B nn 48 T2-mBg=mBa =J+JA=1如六用隔离法列方程：（以逆时针方向为正） o x1 x2 s A M B A B r x m CA CB T1 J T2 r . CA T1 mAg C . B T2 mBg M A o B mA g −T1 = mA a T2 − mB g = mB a T1 r −T2 r = Jβ 2 AB 2 M AB Mr m r 2 1 J = J + J = +