The walls of the alveoli are very thin. There is only （） cells with cubic secretory cells._精华吧

The walls of the alveoli are very thin. There is only （） cells with cubic secretory cells.

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The walls of the alveoli are very thin. There is only （） cells with cubic secretory cells.

A.a single layer of flat epithelial

B.a single layer of columnar

C.a single layer of cubic

D.one layer of variant epithelial

正确答案：a single layer of flat epithelial

Tag：动物解剖生理时间：2021-12-25 22:22:45

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