A.ping192.168.1.1 B.ping192.168.0.1 C.ping127.0.0.1 D.ping10.0.0.1
A.ping http://hao.qq.com/ B.ping 183.60.48.171:443 C.ping www.baidu.com -t -n 100 D.ping www.sohu.com -l 1024 -n 100
A.1310nm B.1490nm C.1450nm D.1550nm