单选题无软骨的结构是（）。A终末细支气管B叶支气管C段支气管D小支气管
单选题
无软骨的结构是（）。
A
终末细支气管
B
叶支气管
C
段支气管
D
小支气管
参考解析
解析：
终末支气管缺乏软骨成分
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