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如图所示，在平面直角坐标系中，抛物线 经过A(-1，0)，B(3，0)C(0，3)，三点，其顶点为D，连接BD，点P是线段BD上一个动点(不与B、D重合)，过点P作Y轴的垂线，垂足为E，连接BE. (1)求抛物线的解析式，并写出顶点D的
2019-07-24
热点推荐： 英语词汇篇章式记忆汇总(20篇文章稿定)
2019-07-24
语言基础知识、语言基本能力和解题技巧等方面提出一些英语备考的策略与建议： 1.依托课本的单元话题记忆词汇。词汇的复习以话题为切入点，这样能较容易地勾起同学们对相关词汇的回忆。可把单词放在句子中记忆，关注
2019-07-24
2019-07-24
上海世博会对中国的影响 As we all know that 2010 World Expo will be held in Shanghai , this is the first time that China hosted the World Expo. The World Expo has a long history but it has never been
2019-07-24
Greenland is the largest island in the world. It is in the 1 of Europe. Near Greenland is another island. It is small. Its 2 is Iceland. Do you think that Greenland is green and warm? Do you think th
2019-07-24
2019-07-24
热点推荐： 英语词汇篇章式记忆汇总(20篇文章稿定)
2019-07-24
根据中文大意和英文提示词语，写出意思连贯、符合逻辑、不少于60词的短文.所给英文提示词语供选用.请不要写出你的校名和姓名. 世界上已有许多国家发现了新型H1N1流感病毒(H1N1 flu virus)病例.据了解，人感染该病毒
2019-07-24
Have you ever asked yourself why children go to school? You will probably __1__ they go to learn languages, geography, history, science and all __2__ subjects. That is quite __3__, but __4__ do they
2019-07-24
热点推荐： 英语词汇篇章式记忆汇总(20篇文章稿定)
2019-07-24
There was once a millionaire who loved money than anything else in the world. He didn t know exactly how much he had, so he took on a little girl to __1__ all his money for him. It __2__ the little g
2019-07-24
The earthquake in Yushu An earthquake happened on April 14th in the Yushu county of Qinghai province. There are many people died in this earthquake. When we heard the news, we were all shocked and sa
2019-07-24
Do you know how to study __1__ and make your study more effective ( 有效的)? We all know that Chinese students usually study very hard for long __2__, This is very good ,but it doesn t__3__a lot ,for
2019-07-24
节约水是我们每个人的责任 As we know, water is very important to man, we can t live without water. The amount of water which is suitable to drink is less and less. But some people don t care about it.
2019-07-24
有关限塑令问题 根据国务院发布的 限塑令 ，自2008年6月1日起，在所有超市、商场实行塑料购物袋有偿使用制度，超市、商场一律不得免费提供塑料购物袋。请你写一篇英语短文，要求包括以下内容： 现状：目前中国每天
2019-07-24
热点推荐： 英语词汇篇章式记忆汇总(20篇文章稿定)
2019-07-24
A. 1-5 CDBCA 6-10 DABDB 11-15 ABCAC 16-20 BABBC 21-25 BDABB 26-30 BCCDB 31-35 DACDD 36-40 BDAAD 41-45 BBBAC 46-50 DCADD 51-55 ACABC 56-60 BABCB 61-65 CCABB 66-70 BBBAC B. 71. driving 72. to help 73.
2019-07-24
Mr. Robinson had to travel somewhere on business, and as he was in a hurry, he decided to go by __1__ . He liked sitting __2__ a window when he was flying, so he got onto the plane, he looked for a w
2019-07-24
根据中文提示和英文书信内容，写一封意思连贯、符合逻辑、不少于60词的回信，信的开头和结尾已经给出，其字数不计入所完成的回信内。 假如你叫Zhang Fang，是美国中学生Lucy的笔友，你收到了她的电子邮件。请根据她
2019-07-24
81. He didn t finish _______(write) the book until last week. 82. --- How long did it take you _______(do) your homework yesterday? --- About half an hour. 83. Let me _______(help) you _______(water)
2019-07-24
2008年政府取消了 五一 黄金周( May golden week )，但是，最近有些人又提出要恢复7天的长假.同学们也在校园网的 自由论坛 上展开了激烈的讨论.请你选用下面表格所提供的信息，写一篇短文，谈谈恢复长假的利与弊，
2019-07-24
现在全世界都在倡导 低碳生活 (low-carbon life)，即：降低二氧化碳的排放，采取低能量、低消耗、低开支的生活方式。低碳生活对我们大家都有好处，请你写一篇短文向一家英文报社投稿。内容包括：你的具体做法、你的
2019-07-24
( )1. She reached the top of the hill and stopped _______ on a big rock. A. to have rested B. resting C. to rest D. rest ( )2. Do you know the boy _______ under the big tree? A. lay B. lain C. laying
2019-07-24
假如你叫李飞，是学校 校园英语报 的编辑。你收到你同学张丽的姐姐的来信。请根据这位姐姐的要求，给张丽写一封回信。 Dear Editor, I am really worried about my sister, Zhang Li. She always watches TV or rea
2019-07-24
( )11. The house is not big enough for us all _______. A. to live in B. to be lived in C. to live D. for living in ( )12. A clock is made for _______ us the time. A. tell B. telling C. to tell D. tel
2019-07-24
( )41. We must try our best to stop the pollution _______ a happier life. A. from living B. to live C. living D. live ( )42. --- Hello, what are you reading? --- A book _______ by Bill Gates. A. writ
2019-07-24
假设你叫Liu Yan，初中三年，你与同学们在一起学习、参加各种活动，相互帮助，彼此之间建立了深厚的友谊.校园网的英语论坛开辟了 Thank you letter 专栏.请按下面的要求给你的同学Ling Feng写一封感谢信.注意：1.
2019-07-24
深刻理解概念。 概念是数学的基石，学习概念(包括定理、性质)不仅要知其然，还要知其所以然，许多同学只注重记概念，而忽视了对其背景的理解，这样是学不好数学的，对于每个定义、定理，我们必须在牢记其内容的基础
2019-07-24
已知：如图所示，关于x的抛物线 与x轴交于点A(-2，0)、点B(6，0)，与y轴交于点C. (1)求出此抛物线的解析式，并写出顶点坐标; (2)在抛物线上有一点D，使四边形ABDC为等腰梯形，写出点D的坐标，并求出直线AD的解析式;
2019-07-24
如图，抛物线F： 的顶点为P，抛物线：与y轴交于点A，与直线OP交于点B.过点P作PD x轴于点D，平移抛物线F使其经过点A、D得到抛物线F ： ，抛物线F 与x轴的另一个交点为C. ⑴当a = 1，b=-2，c = 3时，求点C的坐标(直接
2019-07-24
如图11，AB是⊙O的直径，弦BC=2cm， ABC=60?. (1)求⊙O的直径; (2)若D是AB延长线上一点，连结CD，当BD长为多少时，CD与⊙O相切; (3)若动点E以2cm/s的速度从A点出发沿着AB方向运动，同时动点F以1cm/s的速度从B点出发
2019-07-24
#p#分页标
2019-07-24
2019-07-24
如图，抛物线的顶点为A，与y 轴交于点B. (1)求点A、点B的坐标. (2)若点P是x轴上任意一点，求证：PA-PB
2019-07-24
#p#分页标题#e# 答案解析在下一页 题号 11 12 13 14 15 16 17 18 19 20 答案 B B C C C C D D C A
2019-07-24