单项选择题
图示简支梁受到集中力作用（l = a+b），下列结论错误的是（ ）。
- A．梁在BC段的剪力方程为Fs（x）= Fa / l
B．梁在BC段的弯矩方程为M（x）= Fa（l-x）/ l
C．梁在AB段的弯矩方程为M（x）= Fbx / l
D．梁在AB段的剪力方程为Fs（x）= Fb / l
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