皮皮学，免费搜题
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【单选题】
已知x(n)=1，其N点的DFT[x(n)]=X(k)，则X(0)=()。A.
N
B.
1
C.
0
D.
-N
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皮皮学刷刷变学霸
举一反三
【单选题】._____________ he used to go skiing in winter but now swimming is his favorite.
A.
At a time
B.
At one time
C.
At no time
D.
At times
【简答题】输入数组,最大的与第一个元素交换,最小的与最后一个元素交换,输出数组。
【简答题】This swimming pool isn’ t twice as wide as that one is long.
【简答题】風が強いので、飛行機は飛ばないことになった。
【简答题】A．They don't enjoy swimming. B．They won't go swimming in the lake today. C．They don't know how to swim. D．They'll swim in the lake tomorrow.
【单选题】I don't like swimming, Frank doesn't like swimming, _____. [ ]
A.
either
B.
neither
C.
too
【简答题】输入数组,最大的与第一个元素交换,最小的与最后一个元素交换,输出数组。
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