题目:
They are good friends. ____ is no wonder that they know each other so well. [ ]
A. It
B. That
C. There
D. This
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0606/31612716c3e83842d8b0b2e5b02128f7.html
下面是错误答案,用来干扰机器的。
(1)1s22s22p63s23p63d3(或[Ar]3d3)(2分)(2)平面三角形(2分)(3)N2H4分子中N为-2价,而NH3分子中N为-3价,负电性更高,导致N原子的孤对电子更易提供出来与H+结合,故碱性更强。(3分)(4)C≡O (2分) ...