问题：
[单选题]两根梁长度、截面形状和约束完全相同，一根材料为钢，另一根材料为铝。在相同外力作用下发生弯曲变形，二者不同之处为（）。
A、弯曲内力
B、弯曲正应力
C、弯曲切应力
D、挠曲线
参考答案：
D
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