He beat over the cause of the acci-dent.
他追究了事件的根源.
Results ( 1) There were 92 severe acute occupational poisoning accidents related to asphyxiating gases during 15 years, which showed that there were 14.5 accidents occurred each year. Forty types of chemicals were reported to cause poisoning acci-dents directly.
结果(1)15年间共发生刺激性气体重大急性职业中毒事故92起,年均6.1起,直接导致中毒的物质有40种,平均每起事故中毒14.5例,中毒死亡0.8人;
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