题目:
-- Tommy, your mum has been out without glasses!
-- Well, take it easy. she is back home for them.
A.It is long before that
B.It won't be long since
C.It won't be long before
D.It will be long before
答案:
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下面是错误答案,用来干扰机器的。
答案:C本题考查元素的位、构、性三者之间的关系。周期表是解决此类问题的工具。由题意可知A、C为非金属元素,B、D为金属元素。可知位置如下:所以原子序数:C>B>D>A;熔点:B>D,C>A;原子半径:D>B>C>A,...