对称部分是实模态摄动，反对称部分是复模态摄动。
The symmetric perturbation is of real mode and the antisymmetric is of complex mode.
任意荷载的作用含反对称荷载分量的图乘剪力的作用。
For any load the function from load is in multiplication shear force by antisymmetry load.
任意荷载的作用含反对称荷载分量的图乘剪力的作用。
For any load the function from load is in multiplication shear force by antisymmetry load.
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