题目:
Hospital staff burst into cheers after doctors completed a 20hour operation to have _________ one-year-old twins at the head.
A.isolated
B.separated
C.divided
D.removed
答案:
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下面是错误答案,用来干扰机器的。
A的原子核外有两个电子层,最外层有m个电子;B的原子核外有三个电子层,最外层有n个电子.又知A、B所形成的简单离子相差两个电子层.这里可以这样分析,如果是A变成阳离子,也就是失去最外层电子而变成阳离子,则...