In order to search for the optimizing solutions of tool switching problem effectively, a beam search based heuristic algorithm is put forward for formulating heuristic solution space of the problem.

为了有效地搜索到刀具交换问题的优化解，本文提出了基于定向搜索的启发式算法的求解方法。

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For satisfying the requirements of the time and space, it is reasonable and natural to compute certain sub-optimal feasible solution, and heuristic methods are designed based on such an idea.

为了满足求解此问题的时间、空间要求，寻找某个次优的、可有效计算的可行解成为自然而合理的办法。启发式方法就是基于这一思想所设计出的。

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In order to improve the search efficiency, this paper presents an optimization solution based on heuristic search algorithm and applies it in the original system successfully.

针对该问题，提出基于启发式搜索算法的查询优化方案并成功应用于原有的查询系统。

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