台风预警信号有几种

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某人用手表估测火车的加速度,先观测了5分钟,发现火车前进了3600米,隔五分钟后又观察了5分钟,发现火车前进5400米,若火车在这15分钟内做匀加速直线运动,则火车的加速度是多少? 从离地面H高处落下已知小球,小球在运动过程中,所受到的空气阻力是它重力的k倍,而小球与地面相撞后,能以相同大小的速率反弹,则小球从释放开始,知道停止弹跳为止,所通过的路程? 5:30回家用英文怎么写 僵尸吃掉了你的脑子用英语怎么说要原版的 不要翻译的 1,2题么做物理 2题 2题 请问这道英语选择题应该什么,辛苦了!I still remember you,as a student,_______ sweetly.A.sing B.singing. 翻译 你现在上大几? 矩阵最大特征值与特征向量的计算 矩阵特征值及特征向量计算1 5 1/71/5 1 1/77 7 1 求大神帮忙修改英语EssayWhile we were parking in the lot which belongs to the Asia Pacific Museum,there is colorful graffiti on the wall.I saw the elegant stone entrance when we were walking along with the quiet street.You could see the court 求一篇argumentative essay,(英文好的帮帮忙吧)有关There are no limits to free speech. 跪求英语大神帮忙写一篇English essay.题目:The future status of English as the global language is assured.要求:一、introduction explanation of the issue thesis statement二、body.1; A;:summary of other sides's arg 美国黑人社会地位提高的过程,英语专业写essay考试用!theoretically,the black people in America were given citizenship by the 14th Amendment to the U.S.Constitution in 1868.in reality,most blacks were not allowed to vote and racial se 英语作业本(配人教版) 七年级·下学期 第9、10、1单元的答.(包括作文) 初三数学第四题求解 将方程36X-4Y=56变形为用含X的式子表示Y,并求取2和负5是相应的Y的值 将方程1.5X-3y=1变形为用含x的式子表示y,并分别求出当x=0,x=2分之1和x=2时,相应的y的值 when do you think your mother will be back________,Jerry?b.home ,afterd.home ,to不好意思!后半句:______11:30 this evening.he likes staying long outside. 【追加悬赏20+】■■■■■■■■■■■■初中英语问题■■■■■■■■■■■■■请各位英语高手告诉我benfit的用法.benfit to benfit from benfit of的区别详细解答者【追加悬赏20】,谢 What is Mrs.Smith going to buy?Make a shopping list for her according to the conversation in Training Room.Then write a conversation between Mrs.Smith and the shop assistant.帮我写段话,不是翻译.(M for shop assistant and W for Mrs.Smith)M 怎么对英语对划线部分提问 一篇英语作文,非常感谢你.My Valuable PresentLast Sunday,I had my birthday.I received a special present from my Dad.It was a dictionary.It was thick and colourful.I was amazed to see the thing and opened it on my own.On the first page,I saw 求帮忙修改一篇英语作文whenever i am asked what i 'd like to do in my spare time ,i'll not hesitate a moment to say that i love travelinglast year,l had a short visit to Beijing with my family.it was my first time to get there,so i was curi 请帮忙修改一篇英语作文!Many people are intrested in the compute games,however,some people addict themselves to the compute game.If they don`t control themselves well,not only will it waste time,but also harm eyes a lot .It is well worth th 一篇英语作文,关于西安的改变题目是xi'an is change in my eyes or not 词数150左右吧 写好了奖励200分 英语作文我的爸爸 只有选择填空, —I would love to go to Beijing.—_______.A.So do I B.So would I可我们老师说是B,我很疑惑 八下物理求13题1 2两问 ①—Who is the girl our teacher is talking with?— I don't know.I _____ her before.A.had never seen B.am never about to see C.was never seeing D.never saw②Last Saturday,ther arrived at the farm ______ they had never paid a visit before.A.where B