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【单选题】
建立平面弯曲正应力公式 , 需要考虑的关系有( )。A.
平衡关系 , 物理关系，变形几何关系
B.
变形几何关系，物理关系，静力学关系；
C.
变形几何关系，平衡关系，静力学关系；
D.
平衡关系 , 物理关系，静力学关系；
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A.
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A.
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A.
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most useful
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