7Mbuligwe SE. Levels and influencing factors of noise pol- lution from Small Scale industries (SSIs)in a developing country [ J ]. Environ Manage ,2004 ,33 (6) : 830-893.
8Oliveira MJ , Pereira AS , Guimaraes L , et al. Chronic exposure of rats to cotton mill room noise changes the cell composition of the tracheal epithelium [ J]. J Occup En- vi2 ron Med , 2002 ,44(12): 1135 - 1142.