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【单选题】
关于弯曲切应力公式 应用于实心截面的条件,有下列论述,试分析哪一种是正确的。( )A.
细长梁、横截面保持平面
B.
弯曲正应力公式成立，切应力沿截面宽度均匀分布
C.
切应力沿截面宽度均匀分布，横截面保持平面
D.
弹性范围加载，横截面保持平面
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