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曼彻斯特编码的特点是  (1)  ,它的编码效率是  (2)  。
(1)A、在“0”比特的前沿有电平翻转,在“1”比特的前沿没有电平翻转
B、在“1”比特的前沿有电平翻转,在“0”比特的前沿没有电平翻转
C、在每个比特的前沿有电平翻转
D、在每个比特的中间有电平翻转
(2)A、50%
B、60%
C、80%
D、100%

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软题库参考答案:D、A(仅供参考)

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