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【单选题】
空调与暖风系统延时继电器的作用是（）。A.
在发动机冷却液达到预定温度之前防止加热循环
B.
在发动机起动后转速稳定之前延迟空调系统的起动
C.
在发动机冷却液达到预定温度之前防止制冷循环
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举一反三
【单选题】Which of the following is NOT usually considered as a stem?
A.
Careless.
B.
Fair.
C.
Unselfishness.
D.
Responsibly.
【单选题】听力原文：W. Are you going to the fair next Saturday? M. What fair? W: The annual fair that Riverbell puts on the first Saturday in June to raise money for the Riverdale hospital The fair is being held on ...
A.
To organize activities for children.
B.
To sell local farm products.
C.
To bring tourists to the town.
D.
To make the money for the hospital.
【单选题】Anticyclones are usually characterized by ______．
A.
dry，fair weather
B.
high winds and cloudiness
C.
gustiness and continuous precipitation
D.
overcast skies
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