为一个数据库表生成类型树时，Database Interface Designer将自动定义一个名为row的组。
When the Type Tree is generated for a database table, a group named Row is automatically defined by the database Interface Designer.
用路由拓扑来表示从一个路由组到其他所有路由组的所有路径，并假定路由拓扑是一棵生成树。
It is assumed that the routing topology representing all the paths from one routing group to all other routing groups is a spanning tree.
本文研究了由MSN节点组成的应用层组播网络，提出了度约束最小直径生成树问题，并给出了求解该问题的BCT算法。
The paper studies the application layer multicast networks of MSNs, and presents a heuristic BCT algorithm for degree-constrained minimum diameter spanning tree problem.
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