By using properties of area-load and of shear-force-addition-correction load resultant expression method in beam has been gotten out from generalized diagram multiplication method.
利用广义图乘法的面积荷载和附加剪力修正值的性质，形成表示梁内任意区间荷载合力的方法。
The resultant type of any expression.
所有表达式的结果类型
Creates a resultant column that is a character expression.
产生一个字符表达式组成的新的列。
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