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【单选题】

On February 4,1974,the Capital Building, the newest building in Sao Paulo, was destroyed in a big fire. The fire was started on the 11th floor. Soon the whole floor was on fire. There were 25 floors in the building. As it had no fare escapes (消防梯) ,300 people were trapped (围困) in the fire and they could not escape. Many of them climbed to the roof of the building. The helicopters (直升飞机) came, but there was such thick smoke that the helicopters could not get close enough. At last about 70 people were saved. Down in the street, the firemen could not get close to the building because too many people were watching the fire. The terrible fire lasted about 4 hours and killed over 220 people.
The Capital Building was the highest building in Sao Paulo.

A.
Right.
B.
Wrong.
C.
Doesn’ t say.
题目标签:飞机消防梯
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参考解析:
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【单选题】飞机保持平飞的条件是( )。

A.
升力等于重力,推力等于重力
B.
升力等于重力,推力等于阻力
C.
升力等于阻力,推力等于重力
D.
升力等于推力,重力等于阻力

【单选题】制造喷气飞机()。

A.
最好由一国生产
B.
需要国际分工与协作
C.
与规模经济无关
D.
最好不合作生产