What are three functions of the Cisco wireless LAN controller， which is being used in the Company Centralized WLAN solution network？ （）
Authentication
B. Mobility
C. Security management
D. Transmission of beacon frames
E. Real-time portions of MAC management
F. Real-time aspects of the 802.11 prtocol management
G. SNMP collectio
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体态语可以脱离语言而独立完成一定的交际任务，所以它能代替语言交际的功能。
A. 正确
B. 错误
A tow can override its tug as a result of（）.
A. a mechanical breakdown on the tug
B. adverse tidal current conditions
C. the tug reducing its speed
D. All of the above
商品品种新陈代谢规律意味着（）就要被淘汰。
A. 老商品；
B. 没有需求的商品；
C. 高价商品
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