作者简介：李志华(1964-),男,副教授,主要从事教学和科研工作,已发表论文50余篇.
作者单位：李志华（青岛科技大学机电工程学院,山东,青岛,266042）
耿振中（青岛科技大学机电工程学院,山东,青岛,266042）
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