Which statement is true about voice VLANs? ()
A. When the voice VLAN feature is enabled, all untagged voice and data traffic is sent through the voice VLA
B. The voice VLAN feature is enabled by default.
C. The IP phone overrides the priority of all incoming data traffic (tagged and untagged) and sets the CoS value to 0.
D. The default CoS value is 1 for incoming voice and data traffic.
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车辆行驶跑偏有可能是前后车轮的轮距相差太大。
A. 正确
B. 错误
列车是指编成的车列并挂有特种车及规定的列车标志。
A. 正确
B. 错误
随着我国经济和能源供应发生巨大变化以及我国电力工业的迅速发展,电网的建设和发展面临一系列新的挑战和问题,走集约化道路,进一步发展大电网已成为不二的选择。()
A. 正确
B. 错误