在客户机上运行以下Ping命令,出现下列结果,可能的原因是( ) C:\Documents and Settings\user>ping www.mitu.cn Pinging www.mitu.cn [59.56.176.48] with 32 bytes of data: Request timed out. Request timed out. Request timed out. Request timed out. Ping statistics for 59.56.176.48: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss)