-12的相反数是______;-0.5的绝对值是______;4的平方根是___ 发布时间:2017-04-15 09:17 │ 来源:www.tikuol.com 题型:填空题 问题: -12的相反数是______;-0.5的绝对值是______;4的平方根是______.
题型:填空题 By the year 2020 scientists _____ a lot of research on AIDS.A.had doneB.doC.are doingD.will have done 查看答案