为了解聋哑学生的致聋原因 ,采用询问和测试方法了解致聋原因和听力损失程度 ,结果表明 ,聋哑学生致聋原因以药物中毒为多 ,占 52 .1 5 % ,先天性因素占 1 2 .88% ;听力损失以重度为多 In order to understand the cause of deafness of deaf-dumb students, the causes of deafness and the degree of hearing loss were investigated by means of inquiry and test. The results showed that the deaf-mute students were mostly drug-induced, accounting for 52.15%, and congenital factors 1 2 .88%; hearing loss is more severe