单项选择题

材料在对称循环下的持久极限为σ－1，脉动循环下的持久极限为σ0，静载荷下的强度极限为σb, 它们之间的关系有如下四种答案,正确答案是（）。

A．σ－1＞σ0＞σb
B．σb＞σ0＞σ－1
C．σ0＞σ－1＞σb
D．σb＞σ－1＞σ0

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