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【单选题】
对于分子中含有共轭双键,α,β-不饱和羰基结构的化合物以及芳香化台物,推断化合物类型可采用( )
A.
红外光谱
B.
紫外光谱
C.
质谱
D.
核磁共振谱
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He can take the train to the old part of the city.
B.
He can save a lot of money when he takes the train.
C.
He can save 20 minutes to go to work with the train.
D.
He can take the train to the airport instead of driving.
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A.
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【单选题】The National Bureau of Statistics made a survey on Chinese public's 10 most issues, it shows that ________ ranks the second on the list.
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【单选题】All the figures provided by the National Bureau of Statistics in 2016 proved that compared with women’s status in the past _______.
A.
women ’ s education, social life, employment and health care have been greatly improved
B.
great progress has been achieved in the promotion of gender equality and women's development
C.
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D.
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【单选题】离心泵汽蚀余量Δh与流量Q关系为(    )。
A.
Q增大，Δh增大    
B.
Q增大，Δh减小
C.
Q增大，Δh不变    
D.
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【单选题】Q:How will the new high-speed train affect the man?
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He can take the train to the old part of the city.
B.
He can save a lot of money when he takes the train.
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A.
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查看完整题目与答案