Choose the true statement regarding QoS pre-classify.()
A. QoS pre-classify permits making QoS decisions based on elements from the unencrypted IP packet.
B. QoS pre-classify is required when encrypting voice.
C. QoS pre-classify is an advantage to Service Providers transporting encrypted packets.
D. QoS pre-classify is not designed for IPSec/GRE configurations.
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核电厂、发电厂、飞机场、港口一旦发生火灾需要专职的消防队来救援。
A. 正确
B. 错误
加固肘关节的韧带是()
A. 尺侧副韧带
B. 绕侧副韧带
C. 尺骨环状韧带
D. 桡骨环状韧带
以下传输介质中,传输带宽最宽的是()
A. 同轴电缆
B. 双绞线
C. 光纤
D. 无线介质