第九届电工数学建模竞赛试题

很抱歉，根据提供的引用内容，我没有找到关于第九届电工数学建模竞赛试题的信息。请确认是否提供了正确的引用内容。如果您有其他问题，我将很乐意为您解答。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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