在一定条件下,可发生反应:RO3n-+F2+2OH-==RO4-+2F-+H2O 发布时间:2017-04-20 22:45 │ 来源:www.tikuol.com 题型:选择题 问题: 在一定条件下,可发生反应:RO3n-+F2+2OH-==RO4-+2F-+H2O。则RO3n-中R元素的化合价是( ) A.+4B.+5C.+6D.+7
题型:选择题 As high school students, it’s very important to keep ourselves ______ of what’s happening home and abroad every day.A.to informB.informingC.informedD.be informed 查看答案