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为了满足劳动保护战线上广大年轻干部积极要求掌握业务知识的热望，我们请南昌航空工业学院讲师陈冠周编写了这个讲座。本讲座共１１讲，从本期开始登载，计划用１９期登完。这个讲座内容丰富，通俗易懂，避免了繁琐的公式计算，不仅可以作为初从事劳动保护工作同志的向导，也可以作为短训班的教材。广大读者在阅读中有什么意见和要求，欢迎来信告诉我们。
In order to meet the active desire of young cadres on the labor protection front to grasp the business knowledge, we invited Professor Chen Guanzhou from Nanchang Institute of Aeronautical Engineering to write this lecture. There are 11 lectures in this lecture, which are published from the current issue. This lecture is informative and easy to understand, avoiding cumbersome formula calculations. It can be used not only as a guide for working comrades working in labor protection but also as a textbook for short courses. The majority of readers in the reading of any comments and requests, welcome to tell us.