A给用户提供了完全“透明”的信号通路
B线路利用率高
C实时性较好
D不存在呼损现象
E通信用户间必须建立专用的物理连接通路
电路交换的特点是( )。
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下列选项中,属于属于电路交换技术的特点是()。
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电路交换系统有()和时分交换两种方式。
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The full title of the U.K. is the United Kingdom of ()and ()
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public and private colleges and universities and community colleges offer().
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以太网交换机Store and Forward方式不检测帧错误。()
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()is used for calling and replying,and for transmitting acknowleding and relaying distress alerts.
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The way in which people address each other depends on their age, sex, social group and personal relationship. The English system of address forms frequently used includes first name, last name, title+last name, (), and kin term.
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ANB指令是(),ORB是电路块或指令,与and、or指令不同
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