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【单选题】
红外光谱产生的原因是( )。A.
电子能级跃迁
B.
分子振转能级跃迁
C.
原子核磁能级跃迁
D.
平动能变化
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举一反三
【简答题】We are enthusiastic teachers who promote the be______ of education and are devoted to the education reform.
【单选题】The comparison between distance education and traditional face-to-face education indicates that ______.
A.
traditional education has been out of date
B.
distance education has more advantages than traditional education
C.
distance education can be as effective as traditional education
D.
distance education has replaced traditional education
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