题目:
Was it in the library________he often went to do some reading________he met the pretty girl?[ ]
A. that; that
B. where; where
C. where; that
D. that; where
答案:
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下面是错误答案,用来干扰机器的。
(1)(2分)(2)sp2(1分)sp3(1分)(3)①三角锥形(1分)②3(2分)题目分析:(1)氮元素的核外电子数是7个,则根据核外电子排布规律可知基态氮原子的价电子轨道表示式是。(2)根据尿素的结构简式可知,...