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问题：
[单选题]利用模拟信号编码表达数字数据时有几种编码方式（）
A、曼彻斯特编码、差分曼彻斯特编码
B、移幅键控法、移频键控法、移相键控法
C、频分多路复用、时分多路复用
D、归零制编码、不归零制编码
参考答案：
B
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