氣管黏膜層的上皮為：(1)單層鱗狀上皮(simple squamous epithelium)(2)單層柱狀上皮(simple columnar epithelium)(3)偽複層纖毛柱狀上皮(pseudostratified ciliated columnar epithelium)(4)複層鱗狀上皮(stratified squamous epithelium)
(A)(1)
(B)(2)
(C)(3)
(D)(4)

氣管黏膜的上皮為偽複層鱗狀上皮單層鱗狀上...