The tracheal wall is divided into three layers: mucosa, submucosa and（）._精华吧

The tracheal wall is divided into three layers: mucosa, submucosa and（）.

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The tracheal wall is divided into three layers: mucosa, submucosa and（）.

正确答案：adventitia

Tag：动物解剖生理时间：2021-12-25 22:23:21

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