挑战习题
1/5单选题
难度:

1.下列化学式中,最外层含有一对未成键电子的是
A NH3
B H2O
C HCl
D CH4
提示1:
5YiG5Yir5YaZ5Ye65ZCE54mp6LSo55qE55S15a2Q5byP5Y2z5Y+v55yL5Ye644CC
正确答案:QQ==
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