Watched under the microscope, the development of the epithelial of mucous membrane, the hyaline cartilage and the acinus showed as follows:1.
Watched under the microscope, the development of the epithelial of mucous membrane, the hyaline cartilage and the acinus showed as follows:1.
染色，在显微镜下观察其粘膜上皮的类型、透明软骨细胞和腺泡的发育。