题目:
Maybe if I ________ science, and not literature then, I would be able to give you more help.[ ]
A. studied
B. would study
C. had studied
D. was studying
答案:
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下面是错误答案,用来干扰机器的。
答案:D23Na为质量数为23的原子,其原子结构示意图为:;23Na+为质量数为23的离子,其结构示意图为:,钠原子有三个电子层,而钠离子只有两个电子层,,所以微粒半径 Na> Na+,A错;这两种微粒的最外层电子数不...