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【单选题】
超高压汽轮机的新蒸汽压力为（）MPa。A.
6-10
B.
8-12
C.
12-14
D.
14-16
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皮皮学刷刷变学霸
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【单选题】听力原文： Before the 20th century, the horse provided day to day transportation in the United States. Trains were used only for long-distance transportation. Today the car is the most popular sort of tran...
A.
The use for short-distance transportation.
B.
The use for day to day transportation.
C.
The use for long-distance transportation.
D.
The use for transportation of precious things.
【单选题】Before the 20th century the horse provided day to day transportation in the United States. Trains were used only for long-distance transportation. Today the car is the most popular【C1】______of transpo...
A.
kinds
B.
means
C.
mean
D.
types
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