单项选择题
A.弯曲疲劳 B.扭转疲劳 C.热疲劳 D.腐蚀疲劳
A.<0.125S B.0.125-0.25S C.>0.25S D.>0.30S
A.<0.125S B.0.125-4.25S C.>0.25S D.>0.30S
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