单项选择题
一对标准齿轮啮合时,小齿轮和大齿轮的接触应力分别为σH1和σH2,则它们之间的关系是()。
A.σH1<σH2
B.σH1=σH2
C.σH1>σH2
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单项选择题
两有限长序列的长度分别是12和15,要利用DFT计算两者的线性卷积,则DFT的点数至少应取( )。
A.15
B.26
C.27
D.28
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单项选择题
If someone had the fine things all above his fortune, he would have_______ debt.
A.running
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