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【单选题】
关于材料强度的描述，下列说法不正确的是（）A.
除退火或热轧的低碳钢和中碳钢等少数合金有屈服现象外，大多数金属合金都没有屈服点和屈服现象
B.
材料的比越小，表示材料的σ s 较小，零件的储备强度大，工作可靠性大，因而可避免由于超载而突然断裂的危险，然而材料潜力未能充分发挥
C.
一般制造弹性零件的材料应具有较高的比，通常的σ s /σ b ≥0.8
D.
抗拉强度是金属材料抵抗微量塑性变形的能力
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