The survival rate,pulmonary pathology,pulmonary function index of the experimental rats were compared,and the elements in the bronchoalveolar lavage fluid(BALF) were analyzed for its ultrastructure.

• 对比实验大鼠的生存率,肺病理,肺指数,分析支气管灌洗液(BALF)中的相关成份和观察超微结构。