Zhi-hu ZHANG ; Xiao GENG ; Jin-long MEN ; Bin FENG ; Fang ZHANG ; Cui-juan WANG ; Meng-ing ZHANG ; Hua SHAO
Chinese Journal of Industrial Hygiene and Occupational Diseases 2013;31(12):955-960
China ; Humans ; Maximum Allowable Concentration ; Occupational Exposure ; prevention & control