下列哪一类动物的呼吸方式存在正压呼吸(    )。     A.鸟类   

下列哪一类动物的呼吸方式存在正压呼吸(    )。

    A.鸟类    B.哺乳类    C.两栖类   D.爬行类

答案

C

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