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【单选题】
下面描述正确的是：（ ）
A.
数字通信系统的主要性能指标是传输速率和差错率；
B.
从研究消息的传输来说，通信系统的主要性能指标是其标准性和可靠性；
C.
对于数字通信系统，传码率和传信率是数值相等，单位不同的两个性能标；
D.
所谓误码率是指错误接收的信息量在传送信息总量中所占的比例。
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压力式；压强式
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【判断题】The Barber's Uncle ( ) The barber thought highly of his uncle and that was why he told his uncle's story to his customers.
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【单选题】Benjamin Barber's Fear's Empire presents a case against the recent unilateral impulses in U. S. foreign policy. According to Barber, empire is not inherent in U.S. dominance but is, rather, a temptati...
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【单选题】根据下面的程序,说明输出结果为() array[0]=1 array[3]=2 echo "${array[*]}"
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