局中人数目变化的最小费用支撑树对策问题。

The player number decreasing minimum cost spanning tree game.

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通过事故树的结构重要度分析，提出了预防粮食粉尘爆炸事故的对策，同时给出了具体的预防措施。

According to analysis on the structure importance of fault tree, the countermeasures to prevent grain dust explosion are put forward and the concrete prevention measures are also presented.

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对危害当地古树资源的因素进行了分析，并综合实际情况提出了具体的保护对策。

The factors harmful to the local ancient tree resources are analyzed, and measures for protection are set forth according to actual circumstances.

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