telephones相关论文
该文对电话计费控制问题进行了探讨，介绍了一种话机外接硬件控制系统，用来防止长途受限用户非法拨打长途电话，并对授权用户显示和记录......
Seventy years have passed since 1949 when the People’s Republic of China (PRC) was founded. A newborn would have gray h......
