What's the main idea of this passage?
A.The development of electronic computer.
B.How to operate a computer?
C.What's the use of computers?
D.What do the scientists and technicians do about computers?
第1题
气调储藏技术分为生物降氧和人工气调两大类,生物降氧以() 为理论根据。
A.生物学因素
B.吸附气体
C.置换气体
D.充入气体
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