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【单选题】
按弯曲扭转合成计算轴的应力时，要引入系数α，这α是考虑()。A.
轴上键槽削弱轴的强度的影响系数
B.
弯曲正应力与扭切应力的大小不同系数
C.
弯曲正应力与扭切应力的循环特性不同的系数
D.
弯曲正应力与扫扭切应力方向不同的系数
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