IP地址中，关于C类IP地址的说法正确的是
A．可用于中型规模的网络
B．在一个网络中最多只能连接256台设备
C．此类IP地址用于多目的地址发送
D．此类IP地址则保留为今后使用
参考答案：B
解析： C类IP地址前三位用二进制数110表示，用21位(第3位至第23位)二进制数表示网络地址，用8位表示主机地址，在一个网络中最多只能连接256台设备，因此，适用于较小规模的网络。
用方框中所给词的适当形式填空
2.A_________person always tries to finish the job, no matter how hard it is. 3._______she has made up her mind, nothing will _______ _______. 4.Is it_______for us to take off our hats in church? 5. He_______that we find the cause of the trouble as soon as possible. Everyone agreed. 6. Do you remember every __________ of the story you have just read? 7.I wanted to pay the train _______, but my friend insisted ; ________ I gave in. 8. She persuaded all of us to_________to work instead of taking the bus. |