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【单选题】
由空调器涡旋压缩机压缩过程可知,该压缩机无需吸、排气阀,并且能比较平稳地排出和吸入气体,因而有极高的()效率。
A.
制冷
B.
压缩
C.
容积
D.
散热
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【简答题】Tom and Fred are talking about the year 2020. “What will our world be like in the year 2020?” asks Tom. “I don’t know,” says Fred. “What do you think?” asks Tom. “Well, no one knows, but it’s interest...
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A.
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B.
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C.
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【单选题】【B16】
A.
month's
B.
year's
C.
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D.
year
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