文档编号:JX523 文档字数:15420,页数:48 有CAD图,开题报告,任务书, 摘 要 Abstract The shaft hoister occupies important position, not only it bearing pharynx and laryns equipment in secondary several hundreds meters underground , moreover the shaft transporting the personnel and equipment . 摘 要………………………………………………………………………………………Ⅰ
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