徒弟:前面我们介绍了无绳电话机的单元电路,这一讲请师傅介绍一下俗称大哥大的移动电话手持机。师傅:移动电话手持机以其机动、方便、快捷获取信息,被世界各大国家所采用。在我国始于1987年,先由秦皇岛建立了蜂窝式移动通信网,接着在1988年北京建立了蜂窝式移动通信网,到1993年底,全国开通移动电话的城市已达300多个,到目前,据有关部门统 Apprentice: In front of us introduced the unit circuit of the cordless telephone, this teacher asked about the commonly known as the brother mobile phone handset. Master: Mobile phone handsets with its mobile, convenient and fast access to information, are used by the major countries in the world. In our country began in 1987, first by the Qinhuangdao cellular cellular network established, followed by the establishment of a cellular mobile communications network in Beijing in 1988, by the end of 1993, the country has reached more than 300 cities opened mobile phones, up to now, According to the relevant departments