backupsn.备份
backupn.后备
backup volume cleanup process备份卷清除处理
backup power automatic switch备用电源自投
backup administration strategy备份管理策略
Backup Emergency Communications备用应急通信设施
Backup Intercept Control System备用拦截控制系统(简称贝克系统)
Backup Air Data Sensor Assembly备份空中数据传感器组件
Backup Attitude Reference System备用姿态参考系统
backup protection of transformer变压器保护