题目:
原子吸收光谱产生的原因是()。
A.分子中电子能级跃迁
B.转动能级跃迁
C.振动能级跃迁
D.原子最外层电子跃迁
答案:
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Now a growing number of wild animals are dying out every year. So how to protect the wildlife draws increasing attention. My advice is as follows. First, the government...