下列关于放射性气体氡222 86Rn的说法正确的是 ( ) A.质量数为222 发布时间:2017-06-10 18:28 │ 来源:www.tikuol.com 题型:选择题 问题: 下列关于放射性气体氡222 86Rn的说法正确的是 ( )A.质量数为222B.中子数为86C.质子数为136D.核电荷数为222
题型:选择题 27. I don't like to go swimming with my class even though I like to swim because I am so embarrassed _______ in my bathing suit.A.to seeB.to be seenC.SeeingD.Seen 查看答案