至于电缆不同类型都是可行的，短的比较便宜，有必要做这样一个计划，叶根连接的最大长度的单芯电缆的最小。

Since cables of different types are available and shorter ones are cheaper, it is necessary to make such a plan of hub connection, that the maximum length of a single cable is minimal.

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注意：如果您连接到非根节点或叶节点，您可以查看的信息和可以采取的操作将受到限制。

Note: If you are connected to a non-root node or a leaf node, the information that you can view and the actions that you can take are limited.

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