试题与答案

如图所示的LC振荡电路,在某时刻的磁场方向如图所示,则下列判断不正确的是( )

题型:选择题

题目:

如图所示的LC振荡电路,在某时刻的磁场方向如图所示,则下列判断不正确的是(   )

A.若磁场正在增强,则电场能正在减少,电容器上极板带正电

B.若磁场正在减弱,则电场能正在增强,电容器上极板带正电

C.振荡电流的变化周期为:

D.电场能量的变化周期为:π

答案:

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【说明】
某局域网通过两个路由器划分为3个子网,其网络拓扑结构和IP地址分配如图6-8所示.


【问题2】
以下是路由器R2的配置命令列衣,请将(4)~(6)空缺处的命令/参数填写完整,以实现路由器R2的正确配置。
Router>en
Router#conf term
Router (config) #hostname R2
R2 (config) #int e0
R2 (config-if) #ip address (4)
R2 (config-if) #no shutdown
R2 (config-if) #int s0
R2 (config-if) #ipaddress 192.168.2.2 255.255.255.0
R2 (config-if) #no shutdown
R2 (config-if) # (5)
R2 (config) #ip routing
R2 (config) #ip route 0.0.0.0 0.0.0.0 (6)
R2 (config) #ip classless
R2 (eonfig) #exit
R2#copy run start

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