Select the lighter manufacture workers to be the research target, and divide them to high concentration contact group, low concentration contact group and contrast group based on the type of work ( puff, adjust and assemble).

  • 对象和方法1、研究对象选取从事打火机制造工作的工人为研究对象,并按其所从事的工种(充气和调火)分别将其归为高浓度接触组、低浓度接触组。

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