8. 如圖( 五)所示之甲梁與乙梁,甲梁A點之彎曲力矩與剪力為MA與VA,乙梁 B點之彎曲力矩與剪力為MB與VB,下列何者正確?

(A)VA =0,VB =0,MB =6MA
(B)VA =0,VB =0,MB =3MA
(C)VA =P,VB =0,MB =6MA
(D)VA =0,VB =P/ 2,MB =3MA

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