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【判断题】
一台压缩机的绝热效率为75%，另一压缩机的绝热效率为70%，说明该压缩机的绝热效率高于二级压缩机的绝热效率A.
正确
B.
错误
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举一反三
【单选题】Since historical times, England, where the early inhabitants were Celts, has been conquered three times. It was conquered by_____________. A.the Vikings, the Anglo-Saxons, and the NormansB. the Romans...
A.
the Vikings, the Anglo-Saxons, and the Normans
B.
the Romans, the Anglo-Saxons and the Vikings
C.
the Anglo-Saxons, the Vikings and the Normans
D.
the Romans, the Anglo-Saxons, and the Normans
【单选题】Had I know her name,____
A.
or does she know mine?
B.
and where does she live?
C.
she would be beautiful.
D.
I would have invited her to lunch.
【单选题】I think I know her. She has _____ hair.
A.
short blonde curly
B.
short curly blonde
C.
blonde short curly
D.
curly blonde short
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