He was responsible for our first system of communication based on electricity.
他是我们的第一台电力通信系统的创造者。
Objective To introduce ward calling system based on power line communication.
目的：介绍一种基于低压电力线通信的病房呼叫系统。
Objective To introduce ward calling system based on power line communication.
目的：介绍一种基于低压电力线通信的病房呼叫系统。
应用推荐