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单项选择题

高为31-50m的建筑，当其为新建项目时，下列处理方法正确的是( )。

A.可划分为低区采暖系统，统一采用高压散热器
B.可划分为低区采暖系统，统一采用低压散热器
C.可划分为高、低区采暖系统，散热器均采用低压散热器
D.可划分为高、低区采暖系统，低区采用低压散热器，高区采用高压散热器
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1913年，（  ）创造了革命性的汽车生产线技术。
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B、丰田公司
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单项选择题
Magic（魔法）often forces us not to believe our own eyes or even appears to be breaking laws of physics or nature! The word "magic" has many different meanings. When a bird appears in a hat or when someone declares that he could see into the future－both can be called magic. When a sick person suddenly becomes well or a well person (or even animal) becomes ill, magic is the cause. The British author Terry Pratchett uses magic a great deal in his popular Discworld series of books.
Magic has always been used for fun. People enjoy working out in which cup the little ball is or how he knows which card I was thinking of. Harry Houdini was one of the first world-famous magicians－famous for escaping from deadly situations. Recently David Copperfield, or David Blane, has become very popular for his "unbelievable abilities", such as making the Statue of Liberty disappear or rise.
Magical rings and three-headed dogs may not be real, but does this mean nothing magical really exists? Can you always explain how the magician has done the card trick? Maybe it is better not to explain, but to leave a little magic in our lives. Pick a card, any card…
The author explains what magic is in paragraph 1 by ____.（　　）
A.givingcausesandeffects
B.usingexamples
C.comparingahealthypersonwithasickone
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单项选择题
下列反应错误的是
A、
B、
C、
D、
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