工业以CaO和硝酸反应制Ca(NO3)2·4H2O晶体,为确保制备过程中既不补充 发布时间:2017-08-04 19:46 │ 来源:www.tikuol.com 题型:选择题 问题: 工业以CaO和硝酸反应制Ca(NO3)2·4H2O晶体,为确保制备过程中既不补充水分,又无水剩余,则应选用的硝酸的质量分数为[ ]A.无法计算 B.30% C.63% D.70%
题型:选择题 根据汉语提示写单词。1. You should dress neatly and _______. (整洁地)2. We will _______ (举行) a sports meeting next Monday.3. They _______ (选举) me to be the president of the students' Union yesterday.4. Newspaper remain _______ (受欢迎的) because they give the news in more details than either radios or TVs.5. Who won the _______( 竞赛), do you know? 查看答案