防盗闭路电视及对讲机系统
closed-circuit television security and intercom system
程控对讲系统
program-controlled intercommunication system
大门电话对讲系统
telephone entry doorphone system
可视对讲系统
visual inter-conversation system
联网型可视对讲系统
video intercom connected networks system
楼宇可视对讲系统
building visual conversational system
数字工业对讲系统
digital industry communication system
数字可视对讲系统
digital visual dialogue monitoring system
磁层-电离层系统(MI系统)
Magmetosphere-Ionosphere(MI) system
无限维离散系统系统
Infinite dimensional discrete time systems