设X1,X2,.....X25为取自总体X~N(0,4)的一个样本,则Y=

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His brother bought a new bike last month.(保持原意)My father___ ____a new bike for a month 英译汉:He was such a hardworking student that he achieved the first place in the final exam. This bike____last year.该怎么选?A.has been boughtB.was bought选哪个?有什么区别?为什么? What’s your name and the date of birth?2,WhereWhat’s your name and the date of birth?2,Where will you be studying and what is the course start date?3,What course are you studying?4,Why did you choose to do this course?5,Why did you choose this pa what are the top three things you hope to get out of your high school days请问这句话应该怎么翻译呀?是"你在自己高中生活之外最想得到的三件事"还是"你最想从自己的高中生活中去除的三件事"? What is the date of your birth?如何回答 here is a list of the top six things to do when you are in high school.these things will give you ideas of what your high school life could be like翻译 what is the ( d ) of your birth 程颜,我们一起花开荼靡 I will still put you in my that belonged to three people,the detectives found onlyApart from the blood that belonged to the three people,the detectives found ____ only clue.A.one other B.one another C other one我明白了。other 此处可理解为 “还有,补充” = 麻烦大家帮忙翻译下这句英文"I will put you in my heart that's How can i help___if people to the three people ,the detectives found only ____clue.A one other B one another C other one D another one will miss you,I will keep you in my heart,Lifetime...要准确 怎么变过去分词把这几个词变成过去分词speakcallaskgooffervisitleavetakeplayskip Tom is a student in class. The teacher blamed Tom怎样把这2个句子用定语从句连尽快 过去分词怎么变? 道德的标准是什么?怎样的行为就是不道德的? 顺便告一下怎么变过去分词babysit be bear,beat become begin blow break bring buy can catch come cost cut draw eat feel fight find fly froget forgive get givego grow have/has hear keep know learn leave let lose make meet pay put read ride ru 不道德现象举一些具体的事例, 请问变过去分词的规则是什么? Love is true, why do you always cold and I refuse什么意思? 1、过P(0,3)的直线于曲线C:x^2-(y^2)/4=1仅有一个公共点,求直线l的方程.2、经过双曲线x^2-(y^2)/2=1的右焦点F2作直线l,交双曲线于A、B两点,若AB的绝对值=4,求直线l的方程. she was a teacher last year.改为一般疑问句 20分…已知椭圆C 的中心为坐标原点O ,一个长轴端点为(0,2),短轴端点和焦点所组成的四边形为正方形,直线L 与Y 轴交于点(0,m ),与椭圆C 交于相异两点A 、B ,且向量A P=2向量 P B .求(1)椭 Who was your g_____ teacher last year? 完形填空Last year wa had an English teacher为开头的文章,有10个空,急 A life without a friend is a life without a sun.really? a life without a friend is a life without a sun A life without a friend is a life without a sun. A life without friend is a life without sun是谁的名言这是谁说过的? His brother jonined the a_______ last year.