A.She's never been treated by Dr. Joanna. B.She's been sitting in the waiting room too long. C.Dr. Joanna isn't the very good choice. D.She'd like to recommend a magazine to the man.
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参考答案:
举一反三
【简答题】.一个连续时间信号【图片】从一个截止频率为【图片】的理想低通滤波器的输出得到,如果对【图片】进行理想抽样,下列抽样间隔中的哪些能保证【图片】利用上述低通滤波器后能被不失真低恢复?( )A. B. C. D.