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按照数据传送方向,串行通信可分为( )、( )和( )三种制式。
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【简答题】()的目的是确保网络资源不被非法使用，防止网络资源由于入侵者攻击而遭到破坏。 A.设备管理 B.软件管理 C.安全管理 D.资源管理
【简答题】A．12h B．24h C．4h D．6h E．8h
【简答题】Good afternoon, boys and girls. I’m Li Hong. I’m an English boy. Li Hong is my Chinese name. Look, this is a picture of my family. The tall man is my father. His name is Ken Martin. This is my mother,...
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