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.
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.
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