您可能还会记得，十年前家里要安一部电话还很难。如今，您只要申请，有关部门就会及时上门为您安装。为什么在短短的十年间，会有这么大的变化呢？十年以前，我国的电信网水平低，技术设备都依赖进口，自己生产不出大型程控交换设备，占领我国通信市场的是被称为“七国·＼制 You may also remember that it was hard to get a home phone ten years ago. Now, you just apply, the relevant departments will be promptly come to your door to install. Why in a short span of ten years, there will be such a big change? Ten years ago, the low level of China’s telecommunication network, its dependence on imported technology and equipment, and its own production of large-scale program-controlled switching equipment. The occupation of China’s communications market is known as the "