能斯特方程中φ°是电对的()电位。
A. 电极
B. 标准电极
C. 测量电极
D. 参比电极
与电子邮件传输速度有较大关系的是()。
A. 邮件的大小
B. 发送的距离
C. 发送的时间
D. 选择的网络运营商
并联运行的变压器,若电压比不同或联结组别不同,则()。
A. 各变压器负载分配不合理
B. 变压器短路时,短路电流大
C. 变压器空载时就有环流
You need to configure a new Cisco router to be installed in the Company VOIP network. Which three interface commands will configure the switch port to support a connected Cisco phone and to trust the CoS values received on the port if CDP discovers that a Cisco phone is attached? ()
A. switchport voice vlan vlan-id
B. mls qos trust device cisco-phone
C. switchport priority extend cos_value
D. mls qos trust cos
E. mls qos trust override co