题目内容

零件的截面形状一定,当截面尺寸增大时,其疲劳极限值将随之()

A. 变大
B. 变小
C. 不变

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在载荷和几何形状相同的情况下,钢制零件间的接触应力与铸铁零件间的接触应力相比()

A. 较高
B. 较低
C. 相同

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