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【单选题】
对于编码,以下哪一项是错误的。A.
多级幅度使一个码元可以表示多位二进制位
B.
波特率取决于信道带宽
C.
编码是实现高传输速率的 前提
D.
编码是用数字信号表示二进制位流的过程
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【单选题】在Web开发过程中，建设和测试阶段的目的是（）
A.
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B.
生成项目设计规范
C.
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D.
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