下列粒子中: ①Mg2+ ② ③O2- ④K+, 其核外电子数相同的是( ) 发布时间:2017-07-08 01:55 │ 来源:www.tikuol.com 题型:选择题 问题: 下列粒子中:①Mg2+②③O2-④K+,其核外电子数相同的是( )A.①②③B.②③④C.①②④D.①③④
题型:选择题 — I regret ______ you that you failed the exam. — How I regret _____ so much time playing computer games. [ ]A. telling; wasting B. telling; to wasteC. to tell; wasting D. to tell; to waste 查看答案