网球线四角和五角线有什麼分别?角多有什麼分别?

1.The heavy rain yesterday afternoon off so that the tennis tournament for an hour.
2..Battle to make an end of the war.
3.Some attention to the theory and rules,but some attention and practice skills
4.She is the only thing I can count on people to tell the truth
5.Their relationship is built on trust and understanding on the basis of the
6.Take full advantage of this opportunity,or else you will regret it
7.He believes that the film should not be such a prize
8.Heavy responsibility of the new work,she worried about the
9.He did not see the first page there was a spelling error.
10.I forgot his name,but maybe in a little while I will think of it.

你好~~很高兴为你提供专业解答~~

设原来有x个网球和x个羽毛球，取了y次
根据题意列出方程组：
x-7y=-6
x-4y=9
解得：x=29，y=5
∴一共取了1次，原有网球和羽毛球各29个

用算术法的话，列式如下：
取的次数=(9+6)÷(7-4)=5次
原有网球和羽毛球的个数=5×7-6=29个（或5×4+9=29）

希望能够帮到你~~

She has a tennis bat.

They have basketballs. 他们有篮球.
They have footballs. 他们有足球.
They have volleyballs. 他们有排球.
They have rugbys. 他们有橄榄球.
They have baseballs. 他们有棒球.
They have golfs. 他们有高尔夫球.
希望对你有帮助

Not all his friends like to play tennis.

A
因为飞回的方向为正方向
变化=末动量-初动量

在转换的瞬间,网球和拍子间可以忽略其重力势能的改变,因为他们位置基本不变.只有球的动能转换为拍的弹性势能,然后拍的弹性势能转换为球的动能.

1.Does Lin tao practice tennis every day?
2.Don't fight in the classroom.
3.I have to stay at home and look after my sister.
4.We can't eat in the classrom.
.6.My mother agreed with me last Saturday.
7.What else do you have to do?
8.I helped me mom make dinner last Sunday..
9.I often visit my grandma on weekends.
10.Eating fruits is good for our heath.
这是我自己一个字母一个字母打出来的,绝对七下的水平.
一定要选我!

对啊,应改成Tommy' tennis is in the backpack或用There is Tommy' tennis in the backpack

Those boys have a lot of tennis balls...
（嘿嘿嘿嘿）

I like watching sports games ,such as running,diving,gymnastics,swimming.At the same time,I like mountain climbing,long-distance running,badminton,rowing.as well as swimming,tennis,squash and indoor rock climbing,despite the fact that I am not very skilled.I will be interested to try those novel and safe sports if there is an opptunity,though I am not a bold person.I am also interested in raising small animals and planting vegetables and fruits at home,because I like to get close to the nature.I even planted a small watermelon in a pot with some watermelon seeds once,though it's just a fist-sized one.Do you raise any pets or plant vegetables in your house?It is good for your health if you get a view of green when opening the windows.How many family memebers do you have?Are you living with your family now?I wish you a happy new year!

答：这是一个碰撞模型（理想化物理模型）——作用时间极短、物体位置来不及变化,因此重力势能不变.
因此,网球被反弹起的过程是弹性势能转化为动能而不是弹性势能转化为重力势能.

He has a tennis collections

　　网球(Tennis)
　　Tennis,is a kind of sports interesting but expensive.because you have to buy the pat and balls before you play it,especially the pat is rather expensive,it probably cost you several hundred yuan or even more if you want to buy a better one to improve your playing skill.And the ground is basic condition for the tennis players.As building a piece of ground may cost several hundred thousand yuan,so the expense of renting the ground is higher than that of the other kind of sports.In addition,tennis need good skill and technique,which is not so easy to learn and master,hance the players should spend a long time to learn the basic skill of playing tennis.From the angle of profession,the playing pose is crucial for the person who learn playing tennis primitively,which may decide the future of him.Although playing tennis isn't an easy bussiness for amateur,but it actually is interesting and charming,attracting lots of people including students,white-skirt,and so the expense of renting the ground is higher than that of the other kind of sports.In addition,tennis need good skill and technique,which is not so easy to learn and master,hance the players should spend a long time to learn the basic skill of playing tennis.From the angle of profession,the playing pose is crucial for the person who learn playing tennis primitively,which may decide the future of him.Although playing tennis isn't an easy bussiness for amateur,but it actually is interesting and charming,attracting lots of people including students,white-skirt,and so on.

更多的是改变球的旋转方向来将打回去,这样就是将球的力改变一个方向,能量的转化就相对较少了

解题思路：用网球拍打击飞过来的网球过程中，根据牛顿第三定律分析网球拍打击网球的力与球撞击球拍的力的关系．

用网球拍打击飞过来的网球过程中，网球拍打击网球的力与球撞击球拍的力是一对作用力与反作用力，根据牛顿第三定律得知，两个力是同时产生的，大小相等，方向相反．
故选B

点评：
本题考点： 力的概念及其矢量性．

考点点评： 本题应用牛顿第三定律分析实际生活中力的关系．作用力与反作用力是同时产生、同时消失的．

乒乓球撞在球拍上反弹回去.
篮球撞在地面上反弹起来.
都说明了弹性变形恢复过程中有弹力存在.即发生弹性形变的物体由于要恢复原状,对与它接触的物体产生力的作用,这种力叫做弹力.

Tom doesn't play tennis. Does your school play volleyball?

Does she have a tennis ball?No ,she doesn't.

tennis

['tenɪs]tennis网球

甜点就是网球拍的最佳击球点,时能最大限度发挥拍子力量的位置

三楼的回答很全了,进来回答下LZ对三楼的追问
碳铝合金的拍子一般都不会太重,因为铝合金很轻,再个,碳铝合金的拍子都是低端货,所以在材质方面难免为了省材料多赚钱,所以不用担心碳铝拍的重量问题.
碳铝不是塑料.很佩服楼主的想象力……

解题思路：设一共装了x筒，则共装了5x个，根据“网球总个数-装了的个数=剩下的个数（3个）”列出方程，解答即可．

设一共装了x筒，
1428-5x=3，
5x=1428-3，
x=285；
答：一共装了285筒．

点评：
本题考点： 列方程解应用题（两步需要逆思考）．

考点点评： 解答此题的关键：设出要求的量为未知数，然后根据题意，找出数量间的相等关系式，根据关系式，列出方程，解答即可．

解题思路：选择网球为研究的对象，从击球之前到落地之前，费德勒击球时对球做功，重力对球做功，做功的总和等于球动能的增加．

设费德勒击球时对球做功W，重力做功mgh，由动能定理：W+mgh＝
1
2m
v21−
1
2m
v20]，整理得：W＝
1
2m
v21−
1
2m
v20−mgh故选项D正确．
故选：D

点评：
本题考点： 动能定理．

考点点评： 本题主要考查了动能定理，知道动能的变化量等于合外力所做的功．

篮 球
——仿写《安塞腰鼓》
一群朝气蓬勃的少年.
他们的脚下是绿色的操场.他们脸上洋溢着和太阳一样的笑容.
温暖的阳光洒在操场上,也洒进了他们的心里.
他们的神情沉稳而又带着微笑.紧贴在他们身旁的篮球,鼓鼓的,好像从来没有动过.
但是,看!
一打起来就发狠了,忘情了,没命了.十几个目光如炯的少年,如一头头饿虎,怒熊.对分数的渴望跳出了他们的眼睛.骤雨一样,是急促的运球；旋风一样,是快速的过人；飞燕一样,是轻盈的脚步;火花一样,是激烈的碰撞;流星一样,是优雅的三分；斗牛一样,是震撼的灌篮.学校操场上爆出一场多么豪放,多么壮阔,多么火烈的比赛啊——篮球!
这篮球,使冰冷的空气变得火热了,使恬静的阳光变得灼人了,使昏昏欲睡的人们立即精神抖擞了.
使人想起了西部的牛仔片.
使人想起了罗马的斗兽场.
使人想起了关羽过五关、斩六将.
容不得防守、容不得抢断、容不得盖火锅.是进球了、得分了、灌进了那一股激情.
好一个篮球!
几百个观众的欢呼声,碰撞在一望无际、一尘不染的天空中,天空顿时成了扩声器,只听见“加油!加油!”
几百个观众的欢呼声,传到了看书、休息的人们的心里,人们的心也成了扩声器,也是“加油!加油!”
“加油!加油!”的豪放的抒情；“加油!加油!”的严峻的思索；“加油!加油!”的阳光照射的火辣的汗珠；“加油!加油!”的压抑的解放的舒畅.
好一个篮球!
少年们的胳膊、腿、全身有力地活动着,剧烈地活动着,大起大落地活动着.它震撼着你、灼烧着你、感染着你,它使你从来没有如此明亮地感受到运动的乐趣、火烈与享受.它使你惊异于那一个小小的球可以激发人们无限的耐力,那些少年有如此震撼的力量.
篮球啊,你培育了这样朝气蓬勃的少年,也只有你,才有如此大的力量.
优雅的高尔夫是贵族的运动,在操场上也打不了.
除了篮球,谁还有这样的震撼力啊.
好一个篮球,好一群少年.
每一个动作都充满了激情,每一个动作都活力四射,每一个动作都是技术与天赋的完美配合.每一个动作都使人陶醉在阳光的享受中,让人叹为观止.
好一个烧红了天山,蓬勃了朝气的蓝球.
愈打愈烈,形体成了鲜明又热烈的火焰.
愈打愈烈,火焰散发着光与热.
愈打愈烈,痛苦与快乐,冷静与冲动,技术与天赋,都在这运动中交织!旋转!凝聚!奔突!辐射!翻飞!升华!人,成了茫茫一片；热,成了茫茫一片.
当它嘎然而止时,同学们又回教室上课了.
好像又过回了平淡的生活.
耳畔是一声清脆的上课铃.

He plays tennis very well

这么几天了,你的作文应该已经写好了吧!
作文其实很简单的,围绕主题写出来就好了,把一个一个的字组成一句一句的话!努力吧!那样你真的会有另一片天地的!

A tennis racket

中文:我能借你的网球拍吗?
英文:Can I borrow your tennis racket?

We have no tennis rackets.What about you?
They have many clubs.

你好
按照顺序依次是
Basketball
Tennis
Football
The four table tennis
Volleyball
A baseball bat
Two table tennis racket
希望对你有帮助
答题不易
祝你生活愉快
身体健康工作顺利
学习进步
噼里啪啦
望采纳

Na Li is the most incredible tennis player of China. Up to now ,she got four single titles and two double titles of WTA, and what`s more she is the first chinese player who got the single title during the WTA tour. Besides she is the first top ten player of China who gets NO.7 right now. In 2008 Beijing Olympics Game, she reached to semifinal in the single game. And this year,she reached to the final of Australia open which was the first time for an Asinan player to get into final of a grand slam`s single. And we believe that she can make more miracles in the future.
老了,英语退化了

The tennis movement is liked deeply the people,extremely rich pleasure sports.It not only is one kind whiles away the time,one kind improves one's health way,also is one kind of art pursues and enjoys,certainly it is one kind of exciting competition project.Plays tennis,civilized,lofty,the movement is exquisite,splits out one time every time the good shot,all can make one feel excitedly exceptionally,happy incomparable.
Plays tennis may raise the people quick-moving,the judgment is accurate,responded quick and can enhance the speed,the strength,the endurance,keenly and so on the qualities,to develops the coordination to have the positive role.
The tennis is a good for both young and old movement,all may act according to individual physical strength situation from 8-9 year-old child to 60-70 year-old people to carry on the exercise.The long-term insistence tennis activity,can make the human to maintain the youth vigor and the healthy shape,maintains the exuberant energy and the full mood.The tennis separates the project which the net resists,does not have the bodily contact,safe,elegant.Moreover,plays tennis needs to have a match perhaps the ball friend,like this through plays tennis may promote the friendship,the enhancement unity,the exchange skill at ball games,the development social activity.
The tennis and the golf,the bowling,the pool bingcheng are the world four big gentleman movements.Its origin may trace to 12-13 century France,at that time in the missionary the popular one kind the game which hit a ball with the palm of the hand,the method is two people separates a string in the open area,which made is hitting with the palm of the hand the cloth wrapper the ball hair hits.14 century middles,this kind the indoor sport which whiles away the time for the aristocrat spreads to England from France,16-17 century is the England and France palace is engaged in the tennis activity the prosperous time,the common people does not have the good fortune to step in,the tennis is called “the aristocrat movement”.
In 1873,the English M.wingfield the early tennis fighting method improvement,1874 has further determined the location size and the net height.In 1875,English Board Ball Club has formulated the tennis contest rule.In July,1877 has held the first session of lawn tennis tournament by entire English Board Ball Club in Wimbledon,afterwards this organization changed the tennis location the rectangle (23.77 meter *8.23 rice),each bureau used 15,30,40 and so on records points the law,the net is highly 99 centimeters.In 1884,forced this board ball club by English London Mary to change highly the net 91.40 centimeters.From this time on the tennis movement runs out the palace,moved towards the society.On March 1,1912,Australia,England,France and so on 12 country's nets cooperated representative,held the conference in Paris,established the international tennis federation,the headquarters has been located in London.In 1980,Chinese Tennis Association is admitted for this can the full member.15 minute system origins with 15 divide into record points the law to begin in for 15 centuries,it is refers to in the astronomy the sextant.The sextant altogether has 60 degrees equally with 1/6 circle,each degree divides into for 60 minutes.At that time the tennis competed each bureau to have 4 minutes,4 15 divided into once,4 15 degrees constituted 1/6 circle,used 15 to calculate each ball for the cardinal number the success and failure.As for 45 alters to 40 is for the newspaper minute pronunciation simple reason.At first each is 4 games,each game of 4 minutes.Changes each 6 games to the beginning of the 17th century.
好辛苦的 给分吧

Lucy always beats me in the tennis match.

1.(1)设球碰会的方向为正方向,由动量定理
I=mv'-mv=0.058*30-0.058*(-30)=3.48NS
(2)反弹后为平抛运动,由球的水平位移可知：
小球在空中运动的最短时间为t1=x/v=12/30=0.4s
小球在空中运动的最长时间为t2=x/v=18/30=0.6s
则小球反弹点的最低高度h1=gt^2/2=0.5*10*0.4^2=0.8m
小球反弹点的最高高度h1=gt^2/2=0.5*10*0.6^2=1.8m
即球在墙面上的反弹点的高度范围0.8m

Helen have no tennis racket,and she not like to play it.

图呢?

　　北京时间6月21日,在温网的中心球场,如今可以关闭的顶棚会让球员的尖叫声更加的突出.名宿们认为这有失网球的优雅.而要把所有球员的分贝限制在65以下,下面这十位温网史上最出名的“金嗓子”绝对是主委会最大的难题.
　　第10名：德门蒂耶娃 73分贝
　　有些球员,在自己的整个比赛叫声都不停歇过,其声音就像高音调的哭泣,这在当今网坛特别普遍.而还有一些尖叫是渐升的,很多时候只会在关键分上爆发,尤其是在经历一个较长的拉锯分之后.这种尖叫是充满奋斗热情的,可以很大程度上释放球员的压力.而神仙姐姐显然属于后者.
　　第9名：克里斯特尔斯 75分贝
　　和库尔尼科娃一样,克里斯特尔斯只会在自己处于逆境中用叫声鼓舞自己的士气.这样的声音也会让自己免于外界干扰,而赢下每一分她靠的还是是自己努力的拼搏,而不是尖叫的策略.当然要是能在如今听到小克的声音,对于很多球迷来说绝对是一种享受.
　　第8名：库尔尼科娃 78.5分贝
　　库尔尼科娃只会在自己处于重压下才会发出叫声,和如今女子网坛策略性的尖叫不同,库尔尼科娃她们只是在压力下自然发出的哼声.听起来似乎有点像汽车尾部发出的声音,和当今网坛经久不停发动机般的尖鸣无法比较.
　　第7名：伊莲娜-波维娜 81分贝
　　这位俄罗斯红粉的叫声远比她的球技来的出名.听起来就像是一只即将死去的野兽在痛苦的嚎叫,这让观众十分的痛苦,当然她对手的感觉也好不到哪里去.
　　第6名：阿扎伦卡 83.5分贝
　　典型的现代声音发生器,尖锐的叫声,始终如一的音量和音调.在过去10个月莎拉波娃伤退得时候,她就更让人印象深刻.从分贝效果来说,她和那些火车站应当记录保留的汽笛声势均力敌.
　　第5名：大威 85分贝
　　当大威尖叫的时候,你能感受到一种焦虑,就像一只幼仔快要在流沙中沉默那样的绝望,这让大威的尖叫也在巡回赛上独具特色.在07年那场和莎拉波娃的比赛,解说员都忍不住暗自发笑——开始时让人发笑的,但是慢慢的就会感到难以忍受这样两个高声喇叭不断的对叫.
　　第4名：小威 88.9分贝
　　成绩上比姐姐好,小威的叫声也比姐姐来的大.早期的小威叫声并不是十分的大,但是后来越来越大和她的冠军数目一样往上面涨.她的叫声和她的正手一样极具攻击性,就像一个风砖机一样不断敲打着你的神经.但是小威的声音却很受欢迎,甚至还被电台作为录音播出.
　　第3名：塞莱斯 93.2分贝
　　塞莱斯大概是女子网坛尖叫的始作俑者,典型的双音节发声,一波之后马上是另一波更为猛烈的冲击.有意思的是塞莱斯是第一个因为尖叫声过大而被温布尔登处以罚款的选手.如今塞莱斯仍坚持温布尔登的做法是她感到最遗憾的一件事情.
　　第2名：德-布里托 分贝未知
　　莎拉波娃的继承人,和莎娃的叫声一样具有相当好的持久性和一致性,甚至其频率更高.看她的比赛时候,观众就像置身于F1的赛车场.法国选手雷扎伊就曾抱怨过,我国选手郑洁在今年法网也深受其害,她也直接导致巡回赛主办方们在温网前决定召开一个会议讨论球员尖叫的问题.
　　第1名：莎拉波娃 101分贝
　　无可置疑的沙拉波娃是尖叫女皇,贯穿全场的尖叫,持久性、高分贝绝对让40岁以上的人饱受折磨.尖叫已经成为莎拉波娃比赛的一大特色,她的分贝就像是飞机着陆,甚至有人说那种尖叫已经到了人类的忍受极限.尖叫之于莎拉波娃,就像美貌之于库尔尼科娃一样,让人印象最为深刻.

百度翻译结果：My mother likes to play tennis
满意请采纳

（1）42×3+47×6
=126+282，
=408（元）．
答：买3个排球和6个蓝球，一共花408元．

（2）（100-34）÷3
=66÷3，
=22（元）．
答：一个足球22元．

（3）12×4+8×15
=48+120，
=168（元）．
168-160=8（元）．
答：钱不够用，还差8元．

这个不是网球的术语.而是人体学.
指的拇指和食指之间的指缝两指那块肉,
①经外穴名.出《千金要方》.在手背拇、食指之间,合谷穴前赤白肉际.主治烦热,头痛,眩晕,心痛,失眠,盗汗,牙痛,扁桃体炎,肩胛、手背痛等.
网球中这是最主要的和球拍之间的受力点

My friend is called Eric,He likes play ball games.And he has three footballs , two basketballs ,five volleyballs , ten table tennis rackets and four tennis.

My mother has a basketball,Your father has a football,His brother has a tennis.
I have a what 变成一般疑问句格式为 What do you have

1.Dare you compare with me the tennis?
2.It is still not enough to make me angry for you!

它们是相互作用力,大小相等
网球拍击打网球的力其实是球撞击球拍的力的相互作用力
人的力是作用在网球拍上的,是让网球拍运动,并不是直接击打网球

赞成：李娜向全世界展示了荆楚儿女的顽强拼搏精神奖励李娜是传递正能量。反对：李娜不缺钱奖励李娜可以有其他方式80万应该用在更需要的地方。

解题思路：已知开始时间晚上9时和经过时间107分钟，即1小时47分钟，求结束时刻，用开始时刻加上经过时间，即可得解．

107分钟=1小时47分钟，
晚上9时+1时47分=晚上10时47分，
答：结束时间是晚上10时47分．

点评：
本题考点： 日期和时间的推算．

考点点评： 此题考查了时间的推算即用开始时刻+经过时间=结束时刻．

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