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The bronchioles and walls are supported by cartilage.
The bronchioles and walls are supported by cartilage.
A.正确
B.错误
正确答案：错误
标签：
动物解剖生理
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As the bronchi gradually become smaller, the walls of the tubes become thinner, and the glands gradually decrease or disappear.
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The alveoli are directly connected to the respiratory bronchioles.