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【单选题】
相位跳变大产生的最主要问题是:A.
相位跳变大，扩展的频带就宽，在频带受限信道中信号包络起伏大，不利于信号接收。
B.
相位跳变大会对设备内部产生较大电磁干扰，对设备外部产生较大电磁辐射。
C.
相位跳变大，导致本地载波产生相位模糊问题
D.
相位跳变大，增加定时信息提取的难度
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