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【单选题】
关于自相关函数，（ ）是正确的A.
自相关函数的峰值一定出现在 t =0 处。
B.
随着 t ® ¥ ，自相关函数一定趋近于 0 。
C.
周期函数的自相关函数是非周期函数。
D.
正弦函数的自相关函数仅仅保留了幅值信息。
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【单选题】In old day's, when a glimpse of stocking was looked upon as something far too shocking to distract the serious work of an office, secretaries were men. Then came the First World War and the male secre...
A.
wore stockings
B.
were not as serious as men
C.
were less efficient than men
D.
would have disturbed the other office workers
【单选题】In old days, when a glimpse of stocking was looked upon as something far too shocking to distract the serious work of an office, secretaries were men. Then came the first World War and the male secret...
A.
wore stockings
B.
were not as serious as men
C.
were less efficient than men
D.
would have disturbed the other office workers
【单选题】Why are people not supposed to use words “No”, or “I don’t know”, as saying “no” in Mexico?
A.
Because those words will make people feel betrayed
B.
Because those words will make people feel unsupportive
C.
Because those words sound rude
D.
Because those words will make people sound ignorant
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