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【单选题】
已知被转换信号的上限频率为10kHz，则A/D转换器的采样频率至少应高于 ，完成一次转换所用时间应小于 。A.
40kHz ； 50 m s
B.
20kHz ； 60 m s
C.
20kHz ； 50 m s
D.
40kHz ； 80 m s
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