此行多一个词：把多余的词用斜线( )划掉，在该行右边横线上写出该词，并也用斜线划掉。

解题思路：我国现已形成一个以北京为中心的全国铁路网，南北干线有京哈线、京沪线、京九线、京广线、宝成-成昆线、南昆线等；东西铁路干线有滨洲-滨绥线、京包-包兰线、陇海-兰新线、沪昆线等．

读图可知，该旅客从北京乘高铁到杭州旅游，合理的高铁线路是京沪线-宁杭线，他沿途所看到的景象是麦浪与水乡．根据题意．
故选：A．

点评：
本题考点： 重要的铁路干线、高铁．

考点点评： 该题主要考查我国铁路干线的分布概况，读图解答即可．

我认为是discount 折扣的

小题1:breaking→broken
小题2:ran→run
小题3:the删掉
小题4:√
小题5:patiently→patient
小题6:∧they→and
小题7:book→books
小题8:study→studying
小题9:fast→faster
小题10:∧a few→in/within

略

解题思路：由万有引力等于向心力，可以得到第一宇宙速度的表达式，
根据行星的质量是地球质量的12倍，半径是地球半径的1.5倍，进行比较找出行星的第一宇宙速度，再求出逃逸速度．

第一宇宙速度是近地卫星的环绕速度v=

GM
R，R为星球半径．
行星上的第一宇宙速度与地球上的第一宇宙速度之比：


12M
1.5R


M
R=2
2
所以行星的第一宇宙速度是16
2km/s，所以行星的逃逸速度大约为32km/s．
故选C．

点评：
本题考点： 第一宇宙速度、第二宇宙速度和第三宇宙速度．

考点点评： 本题关键是根据第一宇宙速度的表达式列式求解，其中第一宇宙速度为贴近星球表面飞行的卫星的环绕速度！
求一个物理量之比，我们应该把这个物理量先用已知的物理量表示出来，再根据表达式进行比较．

远渡的地点和此行的目的.
天镜为空中明月··海楼为海市蜃楼··

1.those- these 2.after-since 3.happily-happly 4.was后面加a 5.fall-fell
6.name-names 7. intreresting -interested 8.entered-into 9.are-is 10. ues-used

一个铁和一个硫酸铜反应生成一个硫酸亚铁和一个铜
六个磷和五个臭氧反应生成三个五氧化二磷
两个一氧化碳和两个一氧化氮反应生成两个二氧化碳和一个氮气
一个葡萄糖和六个氧气反应生成六个二氧化碳和六个水
一个氢气和一个氯气反应生成两个氯化氢
一个三氧化二铝和一个氮气和三个碳反应生成两个氮化铝和三个一氧化碳
两个醋酸和一个碳酸钙反应生成一个醋酸钙和一个水和一个二氧化碳
一个碳酸钙和两个盐酸反应生成一个氯化钙和一个水和一个二氧化碳

Went to Australia with my parents last year,in love with the air temperature contrary to our country,whatever where a lot of beautiful pictures,like most is the Great Barrier Reef,is composed of more than 400 kinds of colorful coral,viewed from above,keys as hits the green jade.Is really a very memorable trip!

B.磁性容易消失

解题思路：卫星绕行星做圆周运动，万有引力提供向心力，由牛顿第二定律求出行星的质量，由牛顿第二定律求出卫星的速度，卫星动能的增量是需要做的功，由动能定理可以求出发生卫星需要做的功．

卫星绕行星做圆周运动，万有引力提供向心力，由牛顿第二定律得：
对行星的卫星：G[Mm′
r2=m′（
2π/T]）²r，
对人造卫星：G[Mm
R2=m
v2/R]，
人造卫星随行星自转的速度：v₀=[2πR
T0，
由动能定理得：W=
1/2]mv²-[1/2]mv₀²，
解得：W=
2mπ2r3
T2R-
2mπ2R2

T20；
答：至少应对卫星做功为
2mπ2r3
T2R-
2mπ2R2

T20．

点评：
本题考点： 万有引力定律及其应用．

考点点评： 本题考查了求对卫星做功问题，应用牛顿第二定律、动能定理即可正确解题．

求偏导数时,对谁求,则把别的当做常数即可.

comes
will wake
could,can

ph指这是一个固定词组 phrase
p.p preposition 介词

是“欲问边”,因为作者此行的目的就是慰问守卫边疆的官兵,此时作者的身份是一个监察御史,他就是赴凉州宣慰河西节度使的.

B

分析：航天飞机要和空间站对接，需要在低轨道加速，万有引力不够提供向心力，做离心运动，而运动到高轨道，实现对接．
在相同的轨道上加速，会做离心运动，离开圆轨道，减速，万有引力大于所需向心力，会做近心运动，也会离开圆轨道，所以要实现对接．在低轨道加速，万有引力不够提供向心力，做离心运动，而运动到高轨道．故A、C、D错误，B正确．
故选B．

雪染双鬓,蹉跎岁如云
【时间如白驹过隙,过得很快.】
青衫泥泞,照影伶仃
【羁旅的衣衫有些脏乱,孤独且寂寞】
故乡青山之外,前程无处寻 谁伴我知心,共此行
【他背井离乡,前途茫然,不知所措.愿有一知音,能伴我共走天涯】
与子同衣,生死不吝 素衣簪荆,
【与你同甘共苦,不畏生与死,不管你或贫或富,就算一袭麻衣也心甘情愿】
她笑语如铃 渡 口送行,掩泪句句叮咛
【她表面笑意盈盈替你送行,却不知她其实是掩下悲伤强作欢颜悉心叮嘱】
夜半酒醒,相思寄与卿
【夜半酒意微醺,十分想你】
中庭落英,空笑冷清
【庭院中一地落花,虽美,但因无你只叹冷清】
伊人千里之外,孤窗对月明 愿伴她今生,止飘零
【思念的人在千里之外,独自一人独坐孤窗,想着他,希望与她生生世世相伴,不再令他流落天涯】
琴瑟在御,年岁宁静
【愿与她琴瑟和鸣,白头偕老,携手看岁月静好】
春和景明,当时少年心
【春光明朗,那时的年少情怀】
飞鸟逐云,看山外天无垠 黄粱梦里,得意醉花阴 涉水投奔,春华委顿 衰草离披,而今凄凉意 年 岁几经,得失几场梦醒 伊人老去,故园烟火明 芳草满津,埋没归径
后面大概就是抒情了,劝你珍惜眼前人,大概就是表白,她喜欢你.

C

Hezhou Overview
Members Good morning,welcome to visit Hezhou.I'm your tour guide this trip Elizabeth,you may wish to call me Lisa.Today,you are very pleased to have the opportunity to visit with beautiful Hezhou.3 days throughout the trip,a total of five scenic tour Guposhan other.
If you have any questions,please feel free to put forward,I will answer for you the best of my knowledge.Here,I wish you a pleasant journey and to enjoy our tour guide.
Now what,in order that we can have a smooth and happy journey,I would like to asked a few points.
First,we have been driving the car on the highway,the friends sit in the seats,do not tamper with,and to avoid excessive speed danger,sitting by the window Friends Do not handle or head out of the window to avoid being other vehicles scratch.Tourism is important,but peace is most important.
Second,is to ask friends to note that our car is blue and white dragon car,license plate number is 5158,and down when we want to pay attention to recognize.
The last point is please do while in the care of their own,too,care for our environment because the environment is good that we can live better,I think you will very much agree with it,so,please bring garbage bags to prepare for any time from time to time needs.
Well,that safe and secure,and then it let me give you a brief overview of the next Hezhou,Hezhou in the eastern part of Guangxi Zhuang Autonomous Region,backed by Southwest,for Guangdong,Hong Kong,Macao,in the Hunan and Guangdong and Guangxi provinces (regions) of the junction,the city's total area of 11,855 square kilometers,governing eight-step Zone,Zhongshan Xian,Zhaoping County,Bucheon Yao Autonomous County,population 206 people.Inhabited by the Han,Yao,Zhuang,Miao,Hui,Dong,Yi and more than 20 nationalities.
Hezhou more than two thousand years of history,heritage numerous ancient folk rich natural scenery.Hezhou picturesque pastoral landscape,not only attracts many foreign tourists,but also to become more than the famous Hong Kong TV series of the shooting location.
If we say that Guilin is a world piled Qishanxiushui tourist destinations,then the combination of natural beauty is Hezhou ecological oasis.Hezhou unique sights,through the ages,the number of visitors to dumping,the number of letters have been humbled and privileged.
How,say you have a crash it,then the next we will arrive at today's first stop,Guposhan National Forest!Everyone will get off it,please remember about the appearance of our coach,and then look after their own belongings,pay attention to safety,three in the afternoon we have time at the park gate collections.That explanation for the time being first here,thank you

A

诗中表明作者身份的词是（史）,表明作者行目的的一个短语是（问边）,表明这首诗写的是塞外风光的词有（居延 、 汉塞 、 胡天 、 萧关 ）

穿越 热带 到达南半球.

楼上的不知道重复了多少个数.这题可以,你自己可在稿纸上按首位数从0到9写数呈一直角等腰三角形状,有一定的技巧规律,这里不好讲. 01,24,36,59,78 02,13,47,58,69 03,14,25,68,79 04,15,26,37,89 05,16,27,38,49 06,17,28,39,45 07,18,29,34,56 08,19,23,46,57 09,12,35,48,67

解题思路：卫星绕行星做圆周运动，万有引力提供向心力，由牛顿第二定律求出行星的质量，由牛顿第二定律求出卫星的速度，卫星动能的增量是需要做的功，由动能定理可以求出发生卫星需要做的功．

卫星绕行星做圆周运动，万有引力提供向心力，由牛顿第二定律得：
对行星的卫星：G[Mm′
r2=m′（
2π/T]）²r，
对人造卫星：G[Mm
R2=m
v2/R]，
人造卫星随行星自转的速度：v₀=[2πR
T0，
由动能定理得：W=
1/2]mv²-[1/2]mv₀²，
解得：W=
2mπ2r3
T2R-
2mπ2R2

T20；
答：至少应对卫星做功为
2mπ2r3
T2R-
2mπ2R2

T20．

点评：
本题考点： 万有引力定律及其应用．

考点点评： 本题考查了求对卫星做功问题，应用牛顿第二定律、动能定理即可正确解题．

设行星表面的重力加速度为G,地表重力加速度为g
在星球表面,万有引力=重力,可知G=1/4g
有单摆周期公式T=2π*根号（L/g）可知,在某行星表面的摆钟周期Tx为地球上周期T的两倍,即2s
因此摆钟走慢了

小题1:勾勒了一幅山明水净天高远、秋风万里送行舟的美丽图景。诗人着一“空”字形象地写出了山明水净、天高远的景象，又以“布帆无恙”的典故凸显出自己欢快的心情。
小题1:诗人巧用典故，直抒胸臆，清楚地表达了此行的目的和志向，抒发了憧憬锦绣前程、热烈追求理想的情感。


小题1:此题考查对画面的描绘，翻译前两句，答出氛围特点以及景物所表达的情感。
小题1:本题考查“鉴赏文学作品的表达技巧”考点，能力层次为D，侧重“鉴赏评价”能力的考查。本诗的表现手法是巧用典故，直抒胸臆，用典是借典故抒情。

在相同的轨道上加速，会做离心运动，离开圆轨道，减速，万有引力大于所需向心力，会做近心运动，也会离开圆轨道，所以要实现对接．在低轨道加速，万有引力不够提供向心力，做离心运动，而运动到高轨道．故A、C、D错误，B正确．
故选B．

设物体质量为m,在两极时,读数T1＝mg.在赤道时,重力和拉力的合力提供向心力,T2＝mg－m(2pi/T)^2*R..因为T2=0.9T1,可根据T(已知)表示出R(地球半径)..
然后根据T=2pi*根号下(R^3/GM) 那个公式(你们老师应该有教吧,根据向心力等于万有引力得到)可以用R.T来表示出地球质量M
地球体积公式V=4/3piR^3
到这里用地球质量M,除以体积V就是密度了..
理顺一下思路,就是
1.用T来表示R(向心力公式+条件)
2.用T.R一起表示M(中心天体质量公式)
3.用R来表示V(球体体积公式)
4.用M,V相除得密度(密度公式)

渡远荆门外,来从楚国游

1、出发地 目的
2、描写渡过荆门进入楚地的壮阔景色,画出一幅气势磅礴地万里长江图,写的是远景.
3、入,随.将山水拟人化,给人一种动态的感觉,描述生动具有,使人切实感受到作者当时的心情
4、不是.表达了诗人离开故乡时依依不舍,思念故乡的感情.

1.Welcome to ____(地名,如China、Shanghai、 our company等).It's very nice to meet you.Enjoy your stay / Hope you have a good stay here.
2.Hi,how are you?I am _____.It's a pleasure to meet you
3.I would like to make a toast to our esteemed visitors:to successful business,to our friendship!
4.May I please know your name?老外一般都直呼其名的
5.As friends,we welcome you to visit Shanghai any time.
6.I have been in sales for the company in Shanghai for 4 years.Mr.Liu is my manager 或 supervisor.
说法很多,按情况说吧!

是的 静摩擦力有方向 根据力的平衡 静摩擦力的方向就是该物体所受其他力（除静摩擦力外）的合力的反方向

1出发地 目的 2顺江一路而下进入楚地,眼前一幅山尽水平、辽阔空旷的图画.应该算视觉吧~3.入,随.将山水拟人化,给人一种动态的感觉,描述生动具有,使人切实感受到作者当时的心情 4月亮倒映如飞来天镜,云层缔造的层次如...

76. his改为the 77. nearly改为near 78. moneys改为money
79. owner改为owner’s 80. But改为So 81. call改为called 82. in改为by
83. too改为so 84. polite改为politely 85. really

略

远渡的出发地和此行的目的地

I'm so glad to receive your mail.I want to know what kind of enterprise you want to communicate and what is your main purpose of this visit.Do you want to acquaint yourself with some local enterprises or just directly cooperate with them?Please give me a reply as soon sa possible so that I can contact the enterprises in advance.

读shan第四声

Distinguished guests :the hard way!At this moment you have reached the destination of this trip -- Xiangxi Phoenix.I called XX,today will be able to guide you,it is an honor,I will do my best for you,through the common good Xiangxi Phoenix trip!Phoenix city -- national historical and cultural relics,has been New Zealand's famous writers Luoyiaili praised China for one of the most beautiful small town.Phoenix scenery,convenient transportation and a long history,a lot of heritage,the most important thing is a very pleasant climate,the rostrum of the ancient city.House style for ancient remains,plain Tuojiang quietly flows.Outside a South Mountain National Forest Park,underground art Ailiangdong palaces,built in the Tang Dynasty silk the yellow bridge,world such as the Great Wall of the South.Phoenix beautiful town in Tuojiang River's water,the mountainous region ZHENG Yi-hsiung,Jiang were a few fishing boats,mountains ding morning and Wong,on the precipice of Folk Light Smoke curl,the port Wun Sha Regardless of laughter bright.Shen Congwen's former residence is located in the South China Camp Street,a typical four of the South care homes,the center of ancient homes have a small courtyard with a red stone paved courtyard surrounding the historic houses of brick-wood structure,the house is three,four rooms,a total of more than 10,the Housing undersized,Diao Long painting Fung,antique,just like carvings,especially with the Wood Window Xiangxi characteristics attracted attention.December 28,1902,Shen Congwen on counterparts born here,as well as his childhood spent here,Due to the evolution of history,a lot has changed hands,the house that has been dilapidated,and later it will be a lot of renovation,this 100 ancient homes reappearance marshland,it is hung on the door,"Shen Congwen old home," master,the right one room,Shen Congwen's life in photos.Shen is the second draft of the instrument works and left the rooms display various versions of the text from the book,the house is hanging from the middle of Shen Congwen sketching portraits,left the bedroom,Shen Congwen place of birth,the right of the desktop display of marble desk,and so on.

范文正因为上奏国事被三次罢黜.当初是校理官,因为得罪了皇上被贬到河中,同事朋友在都门给他送行说：“这一次外贬很光彩.”后来当司谏官,因废弃了郭后,率领着谏官们去争取没有胜,被贬睦州,同事朋友们又在亭子给他饯行说：“这一次外贬更加光彩了.”后来做天章阁待制的官,做开封府的府官,撰了个百官图进呈给皇上,丞相发怒地奏明皇上说：“宰相是管理百官的.现在范仲淹自己给自己提拔,哪里能用这种相官?我们强烈要求罢了他的官.”宋仁宗发了怒,把他落职贬到饶州,当时亲戚宾客朋友又在郊外给他饯别说：“这一次外贬最光彩了.”范仲淹笑着说：“我前后已经有三光了,以后各位再送,只乞求一个牢狱就行了.”这句话特别让人不理解,听见最近记录这事的说：直待上牢了,仲淹正是想死吗.宾客们大笑而散,只有王子野不走,坚持着自己留了数个晚上,两人击掌畅快地论述当时天下的好地方和坏地方,恋恋不舍地离别而去.

就你的原题回答：行列式展开不需要什么条件!（但若【希望】展开后是【一个】比原来低一阶的行列式,那么应该是某行（或某列）只剩下【一个】元素非零.）
按你补充的情况回答：可以把第一行《清零》之后按第一行展开,也可以直接按第一行展开.
如,对第一行“清零”（因为这一行已经有一个零了!）
c2-c3*2、c1-c3*x
D=|0 0 1 0|
1+x 3x+2 -1 1
3-2x^2 4-4x 2x -2
1+x 3 -1 x
然后按第一行展开 D=|1+x 3x+2 1|
3-2x^2 4-4x -2
1+x 3 x
直接按第一行展开：D=x*|3x -1 1|-2*|1 -1 1|+ |1 3x 1|
4 2x -2 3 2x -2 3 4 -2
1 -1 x 1 -1 x 1 1 x

你可以到书店或者是将你平常经常知道的中文港口术语,到网上查下,多练习下,相信是没问题的,英语不难学!good good study !day day up!trust me !you will the best !