Functional introduction to Apple's full range of products, professional maintenance, software services and technical support! Telephone consultation.
功能介绍提供苹果全系列产品，专业维修，软件服务及技术支持！咨询电话。
This paper introduces an advanced Internet telephone system-IPTEL. The principle, structure, functional performance and application of this system are presented.
文中介绍了一种先进的IP网络电话系统IPTEL，阐述了该系统的实现原理，系统的结构和功能特点，及其应用范围。
The telephone was out of order, but is functional now.
电话刚才坏了，但现在可以用了。
应用推荐