One way is inhalation. Strain A mice in 3 groups inhaled DCB in 3 different dosages (5, 15, 45 mg/kg) respectively, twice a week. After 3 months, all the mice were killed and their lungs were examined anatomically for lung adenomas.

• 其一是吸入式染毒 ,即利用动式吸入染毒装置 ,使A系小鼠吸入不同剂量DCB(5,15 ,45mg/kg) ,每周两次 ,染毒4个月后剖杀全部小鼠 ,检查肺腺瘤的发生情况 ;