Capacity of Mobile Telephone Exchanges 移动电话交换机容量
Capacity of Office Telephone Exchanges 局用交换机总容量
SPC telephone exchanges 程控电话交换机
automatic telephone exchanges 自动电话交换机
spc digital telephone exchanges 程控数字电话交换机
Capacity of Telephone Exchanges 局用电话交换机容量
In the early 1970s, the majority of telephone exchanges were still electromechanical analog switches.
在70年代早期，大多数电话交换机还是机电模拟转换器。
Electronic technology enables telephone exchanges to cover an ever increasing number of telephone communications.
电子技术使得电话交换机可以处理大批量的电话用户。
KPN has replaced 1,300 telephone exchanges with just 100 IP centres, and raised Euro 1 billion by selling property as it did so.
KPN仅仅用了100部IP中枢就取代了1,300门电话交换机，而且通过出售那些财产筹集了10亿欧元。
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