The county to achieve the urban and rural telephone program control, county, township and village full realization of international and domestic long-distance direct-dial telephone.

全县实现了城乡电话程控化，县、乡、村全部实现了电话国际国内长途直拨。

youdao

In this paper, the principle of HCBK flame -proof telephone with program control and common-battery telephone public-address is introduced.

本文介绍了集程控和共电式扩音功能于一身的HCBK系列程控防爆扩音对讲电话机的工作原理。

youdao

In this paper, the principle of HCBK flame -proof telephone with program control and common-battery telephone public-address is introduced.

本文介绍了集程控和共电式扩音功能于一身的HCBK系列程控防爆扩音对讲电话机的工作原理。

youdao