The total length of long-distance optical cable installed increased by 27,000 sheath km,that of digital microwave links by 14,400 km,and the number of telephone lines by 19.61 million.

 
  • 新增长途光缆27000皮长公里,数字微波干线14400公里,电话交换机容量1961万门。
今日热词
目录 附录 查词历史