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分析91例中央型肺癌3种病理类型与纤支镜检表现、取材的关系．并对提高纤支镜活检取材的阳性率进行讨论．
3. Analyze the relationship between the three pathological types of lung cancer and the performance of microscopy and material acquisition in 91 cases of central lung cancer. And to improve the positive rate of biopsy material obtained by fiberbronchoscopy.