The master controller and customer multi-functional gas meter realize communication through telephone network automatically.
整个系统由主控端和客户多功能煤气表端组成,主控端与客户端通过电话线网实现自动抄表。
3
An RF power meter has one major drawback: it cannot measure frequency, so it may give an "approved" rating to a defective mobile telephone, as in the following two examples.