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在异步传输中，1位起始位，7位数据位，2位停止位，1位校验位，每秒传输200字符，采用曼彻斯特编码，有效数据速率是（13）kb/s, 最大波特率为（14）Baud。(13)A.1.2B.1.4C.2.2D.2.4(14) A.700B.2200C.1400D. 4400

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