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【单选题】
关于理论应力集中系数和有效应力集中系数有以下四个结论，其中__________正确的。A.
理论应力集中系数与 材料性质有关， 有效应力集中系数无关。
B.
有效应力集中系数与材料性质有关， 理论应力集中系数无关。
C.
理论应力集中系数和 有效应力集中系数均 与材料性质有关。
D.
理论应力集中系数和 有效应力集中系数均 与材料性质无关。
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