Both from personal factors and factors of work including assessment rating should be, RULA, so knowledge of: principles in the work of the teacher in order to be aware of the dangers and protect ourselves, away from the problems of an unusual symptom of structural rangklam meat and should be modified in that stance is correct because it is the nature of the teaching for a long time, causing fatigue in the different organs which should be modified or bodily movement while teaching a teaching in between.
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