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【单选题】
奈奎斯特抽样定理：要从样值序列无失真地恢复原时间连续信号，其抽样频率
A.
≤ 2 倍的信号的最高截止频率
B.
≥信号的最高截止频率
C.
≥ 2 倍的信号的最高截止频率
D.
≤信号的最高截止频率
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