文档介绍：                                       (C)                                                                                  (A)                         ,吸入二氧化碳              、5胸椎处分成                                          (B)       ,也是                                       (C)                                                   (B)                                                                 (D)                        ,具有弹性,使管腔保持开放,这种作用主要表现为         (C)              、血管、淋巴管、神经出入于肺的地方称为                   (B)                          ,肺内支气管的各级分支及其终端的大量肺泡又称为        (B)                  ,可以保持肺泡表面张力,保证肺泡结构稳定性,主要由                                                            (D)                   C.Ⅰ型肺泡细胞分泌            D.Ⅱ,一般是:                        (A)                                                              (A)                                                      (D)                                                 (