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【单选题】
原子发射光谱是由于( )而产生的。A.
原子的外层电子从基态向激发态跃迁
B.
原子的内层电子在不同能级间的跃迁
C.
原子的外层电子在不同能级间的跃迁
D.
原子的次外层电子在不同能级间的跃迁
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【简答题】A．It is offered to anyone at any time. B．It is offered by post. C．It is only offered to people with disabilities. D．It is offered regardless of the distance and the money.
【单选题】The only drawback of junk mail is that it wastes out time. 查看材料
A.
Right
B.
Wrong
C.
Not mentioned
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【简答题】At the present time, researchers believe that the only problem with daytime sleep is that it is too short.
【简答题】Wuhan, we’d say... The only way we will defeat this outbreak is for all people to work together in a spirit of solidarity and cooperation. We are all together, and we can only stop it together. This i...
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