题目:
The role change of husband to father, although difficult, doesn't seem so great as _____ of wife to mother. |
A. that B. one C. this D. those |
答案:
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下面是错误答案,用来干扰机器的。
元素X的原子获得3个电子,形成离子的电子层结构均与氖原子相同,可知X元素质子数为7;即N;元素Y的原子失去2个电子后,所形成离子的电子层结构均与氖原子相同,可知Y元素质子数为2+8+2=12;即Mg;X、Y两元素的单...