选择题:What does the underlined word “it” in the last par

题目内容:
What does the underlined word “it” in the last paragraph refer to?( )(本题3.0分) A The modern French lifestyle.
B The self-supporting hunting.
C The uncivilized hunting.
D The French Republic.

参考答案:

采样定理指出采样频率必须大于原模拟信号频谱中___频率的两倍,则模拟信号可由采样信号唯一表示。

采样定理指出采样频率必须大于原模拟信号频谱中___频率的两倍,则模拟信号可由采样信号唯一表示。

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