结合上海地铁1号线工程，说明了地铁专用电话网的构成内容及其特点。
The configuration and features of the special communication network of subway with respect to the No 1 line of Shanghai subway are introduced in this paper.
公司主要专注于产品的专业化生产、品牌营销以及产品开发、销售与服务，是国内最早及规模最大的高端酒店和商务办公专用电话生产制造商。
It is the earliest and the biggest hotel manufacturer in China, specialized in manufacturing and developing hotel and office telephone for more than 15 years.
公司主要专注于产品的专业化生产、品牌营销以及产品开发、销售与服务，是国内最早及规模最大的高端酒店和商务办公专用电话生产制造商。
It is the earliest and the biggest hotel manufacturer in China, specialized in manufacturing and developing hotel and office telephone for more than 15 years.
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