单项选择题
A.创建邮件B.管理邮件C.收发邮件D.删除邮件
A.IP 地址 B.MAC 地址 C.端口号 D.应用协议
A.route B.ping C.netstat D.ipconfig
A.get B.get-next C.set D.trap
A.<input type="text" name="T1" size="20"> B. <textarea rows="1" name="T1" cols="20"></textarea> C.< input type="radio" value="T1" checked name="R1"> D.<select size="1" name="T1"></select>
A.<html> B.<title> C.<br> D.<p>
A.170.18.128.0/21 B.170.18.128.0/22 C.170.18.130.0/22 D.170.18.132.0/23
A.115.17.198.0 B.115.17.206.0 C.115.17.217.0 D.115.17.224.0
A.1024 B.1023 C.1022 D.1000
A.192.178.32.0 B.128.168.32.0 C.172.15.32.0 D.192.168.32.0
A.路由器B.主机C.网卡D.网段