automatic switching
自动切换
自动投切
自动转换
自动交换
自动开关
自动倒换
自投
automatic switching network
automatic switching machine
automatic switching unit
automatic switching equipment
Automatic Switching Device
automatic switching center
automatic switching procedure
automatic switching controlling
automatic switching panel
automatic switching recorder
Automatic Switching Optical Network
full automatic switching network
automatic switching of telegraph
Backup Power Automatic Switching
spare power automatic switching
all-optical automatic switching network
automatic switching in undervoltage