之后提出了一种基于最大距离的聚类中心分割策略，来解决聚类中心的选取问题。

Then, a cluster centroid splitting strategy is proposed based on maximum distance to resolve the problem of selecting cluster centroid.

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本文在FREE状态测试模型的基础上，提出了一种基于状态的增量式类测试策略。

This paper puts forward a state-based incremental class test strategy on the basis of the FREE state test model.

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讨论：A类论文报道了先前有效的、公开发表了的或者基于专家意见的检索策略。

Discussion: The articles in category a reported a previously validated search, a published strategy, or strategy based on expert opinion.

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