Chalk blown eye treatment?
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Students and from morning to night in the classroom responsible for the effaceurs task, the greater the health hazards of underage students chalk dust less resistance. It is recommended to use the chalk dust
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Keywords：Chalk dust hazards, Environmental friendly chalk, Chi Heng chalk
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![[The foreign trade] Four suction card chalk](/userfile/10001/u21/201655/20160505004930899.JPG "[The foreign trade] Four suction card chalk")
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