单选题:通风系统按空气动力学不同分为(  )和机械通风。

题目内容:
通风系统按空气动力学不同分为(  )和机械通风。 A.工业通风
A.工业通风
A.工业通风
B.换气通风
B.换气通风
B.换气通风
C.自然通风
C.自然通风
C.自然通风
D.全面通风

D.全面通风
D.全面通风
参考答案:
答案解析:

中秋节为每年的盎匝(lunar calendar)八月十五曰,是中国仅次于春节的第二大传统节日。这一天是家人团聚的日子,

中秋节为每年的盎匝(lunar calendar)八月十五曰,是中国仅次于春节的第二大传统节日。这一天是家人团聚的日子,月亮是中秋节庆祝的主题。全家人聚在一起品

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