Electronic book readers must have some method of downloading books: The Amazon Kindle USES a cellular-based network connection to connect directly to Amazon's server.

电子图书阅读器必须通过某种方式下载图书：Amazon Kindle使用一种基于手机的网络连接来直接连接到Amazon的服务器。

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So based on planning idea of bus routes graded, a new planning method of bus network graded and mutual connect underground and free bus transfer junction stations is researched.

因此，本文基于公交线路分级思想，提出了一种分级公交线网与地下互通式免费公交换乘枢纽相结合的公交线网及枢纽规划设置新方法。

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On the basis of electrical connect graph drawn, the generally used method of graphic modeling of power system and the automatically identification of power network topology structure are studied.

研究了基于所绘电气接线图的电力系统通用的图形化建模方法，以及电网拓扑结构的自动识别。

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