DWDM开放式系统（为一链形网络A：OTMB：OLAC：OTM）如果已经接入波业务，A站第十三波TWC到M32单板之间的尾纤弯曲过大导致第十三波业务完全中断，那么通过网管可以查看得到有如下告警（） ["A站MS1板有CHAN-LOS告警","A站M32板有MUT-LOS告警","C站D32板有MUT-LOS告警","C站MS1板有CHAN-LOS告警"]
怎样保护密码？
演绎推理
When using IP SLA FTP operation， which two FTP modes are supported？ （） ["Only the FTP PUT operation type is supported.","Active mode is supported.","Passive FTP transfer modes are supported.","FTP URL specified for the FTP GET operation is not supported."]
高等教育
自由流速度
