The Cisco NAC Appliance is able to check which three items before allowing network access？（）
A. client antivirus software state
B. personal firewall settings
C. wireless cell bandwidth availability
D. IOS versions for routers and switches
E. appropriate client patch management level
F. appropriate QoS settings for client applicatio
CFC refrigerants exposed to high temperature or direct flame, will decompose and may produce（）
A. methyl chloride
B. ammonia
C. hydrofluoric acid
D. ozone
海运托运单和海运提单都是托运人和承运人运输合同的契约，尽管形式不同，但作用是相同的。
A. 正确
B. 错误
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