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【单选题】
叠加法计算梁的最大挠度的正确方法是A.
先分别求出每种简单荷载单独作用下梁的最大挠度，然后进行代数相加，得到最大挠度。
B.
先分别求出每种简单荷载单独作用下梁的挠曲线方程，再将它们叠加得到挠曲线方程，最后计算其最大值，即为最大挠度。
C.
先找出最大弯矩所在截面，再分别求出每种简单荷载单独作用下该截面的挠度，然后进行代数相加，得到最大挠度。
D.
先找出最大剪在截面，再分别求出每种简单荷载单独作用下该截面的挠度，然后进行代数相加，得到最大挠度。
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