两分钟双声道、16位采样位数、22.05KHz采样频率的声音,在不压缩、容量单位为Kilobyte

砖红色沉淀,成分为氧化亚铜,2价蓝色铜离子被氧化成一价亚铜离子.

1、每层用时：2分+1.5分=3.5分,
2、上下共用时：13.02时-12.20时=42分,
3、42÷3.5=12
答：这座高楼共12层.

During the winter vacation,nothing is different for my life.I wake up 10 o’clock Am everyday,after a washing,I have a good lunch with my parents.Next I watch tv till the time to have supper.After have dinner.I go on watching till 12 o’clock ,and then go to sleep with tired.This is one dull day of my winter vacation.
But I haven’t bored all the time.Sometimes I read the books or paly computer game ,sometime I listen to the music in the bed,because it was very cold outside and rainy all the day.And I also meat some of my good friends during the vacation ,we have a very long talk about the life of each other in the past year and play table tennis tegether .And I watched the spring festival party of the CCTV in the last seconds of the 2006 year!I think this is the thing most people of china doing at that time.
That’s all,all my dull,coldly and snowy winter vacation.

Hello,everyone!Today i would like to tell you my trip to HongKong.Of course,this is my first time to go there.
We all know that Hong Kong is one of the two special administrative regions of the People's Republic of China,along with Macau.Comprising more than 260 islands,the territory is located on the eastern side of the Pearl River Delta,bordering Guangdong province in the north and facing the South China Sea in the east,west and south.
During my trip to HongKong,i visited the ocean park,which is rather beautiful and interesting .I bought quite a lot of make-ups,cheap shoes and clothes in the Landmarks.No wonder it is called the shopping paradise.
Apart from so many places of interest,HongKong is famous for its various kinds of food.I really enjoy the mouth-watering desserts there.Also,the crystal cake(水晶饺）,the dim sum(甜点）,the hot pot and hawker food(街边小吃）.
The most impressive thing in my mind is about the nightlife.You may say that HongKong seems like a small city,but actually its nightlife and entertainment facilities can compete with any other international metropolis.You can find a vibrant atmosphere here at night in HongKong created by the dazzling neon lights.
This trip brought me plenty of happiness and pleasure.Also,it was the first time that i went on a trip by plane.I felt so excited about it.I would really appreciate if i can go to HongKong again in the future.
Thank you.
(2分钟应该够了...

分情况讨论：
没有红灯时： （2/3）^4=16/81
一次红灯： C(4,1)*(2/3)^3*(1/3)=32/81
两次红灯： C(4,2)*(1/3)^2*(2/3)^2=24/81 C(4,2)=6,表示4个中任意两个为红灯的组合数
故总概率为： 16/81+32/81+24/81=72/81=8/9

3

There are still many problems of environmental protection in recent years.One of the most serious problems is the serious pollution of air,water and soil.The polluted air does great harm to people’s health.The polluted water causes diseases and death.What is more,vegetation had been greatly reduced with the rapid growth of modern cities.In conclusion,the environmental matter is an important issue that directly affects every human in the world!

你好
首先你自己不要悲观,想开一点嘛.还有,我看了一下,你是作文想不出来?还是写的慢呢?如果真是这样,那你平时就得多看课外书了,平时没事干就多练习一下,就把它当做考试一样.这次考不好没关系,还有下一次呢!下次你可要努力了!

在炉盘那有漏气的地方当泄露量达到一定浓度时就会发出你描述的声音,你先找到漏气的地方,堵上就好了,如果不行的话那就是炉盘不行了,你需要换一个

:Could you tell me how much it is?
（您能告诉我这个的价格是多少吗?）
B:In the neighbourhoud of $ 500.
（500美元左右.）
A:That’s way too much money.
（价格太贵了.）
B:We can make dow by model.
（我们可以根据型号给予优惠.）
A:We have to ask for another price reduction.
（再给我们优惠点儿吧.）
B:You can fourget about another cut.
（不能再降价了.）
A:How much are you asking for this?
（这个多少钱?）
B:I’m offering them to you at 10 Euro a piece.Is that all right?
（每件10欧元,您看怎么样?）
A:Is tax already included in ther price?
（这个价位含税吗?）
B:Yes.Our price can’t be matched.
（是的.我们的价格无人可比.）
A:Would you consider a volume discount?
（批量购进可以再优惠吗?）
B:If you buy 1000 or more,you’ll get a 10% discount.
（如果您能购进1000件以上我们就可以优惠10%.）
A:I’ll accept your offer.
（好的,我接受.）
旅游中用英语订旅馆的小对话：
A：能为您效劳吗?
B：请稍等片刻.
A:Can I help you?
B:Wait a minute,please.
A：您预定了吗?
B：没有,我想要订一间有一张双人床的房间.
A:Have you made a reservation?
B:No,I’d like to book a singe room with one double bed.
A：您准备在这里住多久?
B：2 晚,请问房价是多少?
A:How long will you be staying by us?
B:2 nights,how much soes it cost?
A：一间单人房是100美元/天.
B：这些费用包括所有的服务吗?
A:A single room cost you $ 100 / day.
B:Dose the charge include everyting?
A：是的
B：需要付押金吗?
A:Yes.
B:Do you require a deposit?
A：不需要,您可以在退房的时候结帐.
A:No,You can pay when you check out.
晚饭做好了吗?
Is dinner ready?
还没呢.
Not yet.
晚饭吃什么?
What’s for dinner?
吃汉堡肉饼.
Salisbury steak.
太棒了.
Great!
今天吃咖哩饭.
Today,we’re having curry.
还要多久才能做好呀?
How soon can you get it ready?
再有5分钟吧.
In about five more minutes.
可以吃了吗?
Shall we begin?
请先吃吧.
Please go ahead.
开饭啦!
Come and get it!
*这句直译为“来端菜!”it是指“做好了的饭菜”,全句的意思是“饭做好了,来吃吧!”.是母亲常说的话.
It’s time for dinner!该吃晚饭啦!
晚饭好了啊!
Dinner is ready!
手洗干净了吗?
Did you wash your hands well?
洗干净了.
Yes.
我不喜欢吃芦笋.
I don’t like asparagus.
不许挑食.
Don’t be picky.
谢谢您的款待.
It was very delicious.Thank you.
谢谢您丰盛的晚餐.
It was a wonderful dinner.

215/2=107.5取整数需要烤108次 每次4分钟108*4=432分钟

10

反驳对方的xxx论据不能说明他的论点,在说明自己的论点和论据!200字!

口语考试应该自己写

x/80=x/60-5得1200

Parents are always right
In modern society, some children hold the view that parents’ opinions are too out to accept. However, in my opinion, parents are always right. Some main reasons are as below: To begin with, parents know the things better than children. They have not only visited more places and experienced more events, but they have encountered and dealt with more difficulties as well. That's why they think deeper and wider when considering a solution. Accordingly, they will make less mistakes. On the other hand, parents always use their successful experience or some lessons to teach us. And all of them are based on a lot of trials and errors. That means what your parents say has been tested and proved to be useful. As the old saying goes, "Who never consults an old man may suffer loss." As previously mentioned, listen to your parents attentively and patiently, for they are always right. Thank you for your listen.

楼主不妨去时事一点通网站看一下上面的时事评论,然后摘抄下别人的观点,或者自己发挥各200-300字,相信两分钟的演讲稿就出来了,祝楼主好运

15秒广告播放次数为x
30秒广告播放次数为y
15x+30y=1
y>=1
上面三式联列的
x+2y

该闹钟每小时慢两分钟,实际1小时该闹钟显示的是58/60小时
实际时间是7+(12-7)÷(58/60)=7+150/29=12点10分21秒

那么别浪费时间,因为时间是构成生命的材料.（富兰克林） ◇荒废时间等于荒废生命.（川端康成） ◇抛弃时间的人,时间也抛弃他.（莎士比亚）

-----N2 + 3H2= 2NH3
开始 x x 0
反应 2 3*2=6 2*2=4
最后 x-2 x-6 4
根据N2的浓度,X－2＝7,计算出X＝9,则氢气的起始浓度为X=9MOL/L

I like doing sports and reading in my free time. My favorite sport is basketball. I often play basketball with my classmates after school and play with my friends on weekends. I like playing basketball because it can make me strong and health. What's more, I can make friends who have the same interest. I also like reading because I can get lots of knowledge from books and the books can tell me more about the world. Books are our best friends and they can widen our horizons. I like many kinds of books,like story book, novels and so on.Maybe you can find the interesting things in a book. If you read very much, you will get lots of knowledge.

Two Sisters
Two sisters find new jobs as saleswomen in a company. The first month is not easy. They work hard but sell nothing. The younger sister gives up in the second month. She leaves the company and finds another job. The older sister stays. She says she wants to have one last try. One year later, the older sister owns a car and a house. But the younger sister is still poor.
The younger asks her sister: “Why?” the older sister says, “ I got my first order the day you left. They liked my work. So they gave me more orders. Now life is good for me.”
So, keep working and never give up. You’ll get what you want.

每分钟吹一次,经过一分钟有一半破了经过两分钟还剩下二十分之一没破,经过两分半钟肥皂泡全破了
第20次吹出100个新泡泡时就是100个新泡泡
第19次吹出的100个泡泡就剩50个泡泡
第18次吹出的100个泡泡就剩5个泡泡
第17次吹出的100个泡泡就全破了
所以当笑笑第20次吹出100个新泡泡时,没破的泡泡共有100+50+5=155个泡泡

设小亮家到学校距离是X米可列方程式如下：
x÷40－2=（x-40×2）÷50＋2
解此方程式可得x=480m
主要是小亮出发到学校是时间是有一个共同参照值的!

1、李伯伯跑步用了9.7分钟,刘伯伯多用两分钟,即刘伯伯跑完1.5千米用了（9.7+2）=11.7分钟
2、刘伯伯跑一千米用时=(11.7分钟*1千米)/1.5千米=7.8分钟
3、即刘伯伯跑一千米用了7.8分钟

open the juice machine

这一段话,来自于一个国外的介绍,专门讲圣诞节的标志之类的,很可爱的,希望能够帮到你啊
Christmas Day is celebrated on December 25th of each year.It is the day Christians celebrate the birth of Jesus Christ.The word "Christmas" means "Christ's Mass" - derived from the English term "Christes masse".There are many different customs and traditions around the world.American customs come from many places.Santa Claus has a Dutch origin.He was developed from St.Nicholas who was a real person.St.Nicholas,was the patron saint of school boys.He brought gifts to the children.The idea that Santa Claus comes down the chimney originated in Norway,where children hang Christmas stockings on the fireplace mantel.Christmas trees have pagan origins.When pagans became Christian,they used evergreens (a sacred tree) for the holiday by decorating them with nuts and candles.They sang Christmas carols as they danced around the Christmas tree.
Christmas colors are red and green.Today,traditional Christmas activities include caroling,making and giving gifts,sending cards to family and friends,and enjoying festive dinners and parties.Below are symbols of Christmas and their significance.

1、420×3=2X,X=630
2、180×16=192X,X=15,
3、80：5=256：X,X=16,
4、12×25=20X,X=15
5、480：4=X：15,X=1800
6、(0.6×0.6)×125=(1×1)X,X=45
7、a的四分之一是24×1/4=6,
b的六分之一是6,b=36

Gloria is a famous hostess of a TV station.When she was 15,she happened to walk into a bookstore in her hometown and began looking at the books on the shelves.Hie man behind the counter,John Smith,asked if she'd like a job.She needed to start saving for college,so she said yes.
Gloria worked after school and during summer vacations,and the job helped pay for her first year of college.During college she would do many other jobs:she served coffee in the student union,was a hotel cleaner and even made maps for the Forest Service.But selling books was one of the most satisfying jobs.
One day a woman came into the bookstore and asked Gloria for books on cancer.The woman seemed anxious.Gloria showed her practically everything they had and found other books they could order.The woman left the store less worried,and Gloria has always remembered the pride( 自豪) she felt in having helped her customer( 顾客).
Years later,as a television hostess,Gloria heard about a child who was born with problems with his fingers and hand.His family could not afford an operation,and the boy lived in shame,hiding his hand in his pocket all the time.
Gloria persuaded(说服) her boss to agree to let her do the story.After the story was broadcast,some doctors called,offering to perform the operation for free.
Gloria visited the boy in the hospital after the operation.The first thing he did was to hold up his repaired hand and say,"Thank you." What a sweet sense of satisfaction Gloria felt!
At Smith's bookstore,Gloria always realized she was working for the customers,not the store.Today it's the same.The TV station pays her,but she feels that she should work for the people who watch the programmes,helping them understand the world better.

20小时.

火车长度：72*2/60-2=0.4km
2-04=1.6km
1.6/72*60=4/3 min=80sec
火车长度400米,全部在隧道时间80秒

语文x分钟
数学x-8分钟
英语x+2分钟
数学英语总共用了2x-6分钟＝38
x=22
总共3x-6分钟=60分钟

塑身与修身（心灵的左旋肉碱）
现在的电视节目,都少不了减肥整容类的广告和专题节目,从药物减肥,器材减肥,到生物减肥,什么左旋肉碱,听起来怕怕的,但已然是风气一片挤上了时尚列车.不管与哪种方式,说是为了健康,其实都是为了美,人生而不平等,你看（指着现场美女,和自己的丑陋）,老天呀,真不公平!于是我也得去挤这趟时尚列出啦,实在是相形见拙（做个动作）.然后谈到心灵修理也是同样的道理,所以要读书,要不断得充实自己.不好意思啦,自己组织文字.

80个+ 一分钟前的 （80/2） + 2分钟前的（80*5%)
= 80 + 40 + 4 = 124

1. Today you early or delayed two minutes over the phone
In 2, I live in the south of China
In 3, I eat soup with rice as early breakfast this morning
4, rice and noodles differ in that the former is the raw material of rice and the latter is the raw material of Wheat
5, there are two students for TB, so blood asked the two students to go home a year off to recuperate
6 make provision against a rainy day
望采纳,谢谢

10分钟=600秒 第一次吹的在第150秒的时候消失
在120秒的时候第一次吹的剩下4个60秒吹的剩下40个120秒吹的剩下80个一共124个
依此类推 在600秒的时候地480秒吹的剩下4个 540秒吹的剩下40个 600秒吹的80个
4+40+80=124

传声筒：由第一个人观察一个特定的人或事物进行描述,告诉下一个人,由下一个人再转述听到的,依此类推,最后让参与者把自己听到的信息书写出来,对比强调沟通.

半夜天风扫祝融.山灵催日上瞳眬.

实际时间就是比快表迟了60/（1+2）=20分钟
为此买表到退货过了20小时

最好不用盐酸,铝出现点蚀是因为盐酸中含有氯离子导致的

Whether there’s afterlife, the answer has never been the same. The atheists deny after life, believing that our life is no more than from the cradle to the grave. They may care about their illustrious...

少壮不努力,老大徒伤悲
这个名言告诉我们要珍惜时间、努力读书.小时侯不勤奋读书,就学不好,等到了老的时候,就等于没有一点用了,那时侯,就会后悔莫及,很伤心当初为什么这么不努力.所以,我们小时侯就应该好好学习,天天向上!

"i am an 17-year olg senior middle 3 student in kao yip middle school"——an改为a
“i like planning some schedule,and start everyday according to the schedule,i think that will let me have organization.”——改为i like making plans and working according to schedule , which i think will make me well organized .
"my habby is reading, i believe reading will give me some useful things ,"——habby改为hobby,give改为teach
"i always spend a few hour for reading"——去掉for,hour变为hours
"i trust my ablity is not lose everyone,i just lose my patience"——改为i believe i won't be less talented than anyone else , i think i only lack some patience.
"my philosophy is the higher the price,the better the quality of the merchandise"——改为my philosophy is that the more expensive the goods are , the better their quality will be.
"if i pay more price will get more benefits."——改为if i spend more money , i will get more benefits.

设规定的时间是x分钟
60(x+2)=80(x-2)
解得x=14
60(x+2)÷150=6.4分
骑自行车每分钟走一百五十米要6.4分钟

900除已12等于75

跳得比我们所有人远
jumped farther than all of us
（jump 的时态要看语境选择）
在南京路右转
turn right at Ninjing Road
比我快两分钟
Beats me by 2 minutes
或（按上下文）
Faster than me by 2 minutes
get up earlier
早点起身
follow him along the street
沿着街道跟踪他
也可译为（按上下文）
沿着街道跟着他

A：Do you know the most interesting festival in America?
B:Um...Let me see...I don't know.Could you tell me?
A:I think it is Christmas Day.
B:Why do you think so?
A:Because I can see Christmas Father on that day.And I can get a gift nfrom him if I hang a stocking on my bed.Isn't it interesting?
B:Oh,yes ,yes.It is interesting.But you know the gift is given by their parents .
A:Yes,I know.But their parents are so kind.They do it on that day every year.
B:Yes,maybe they think it is their jobs and maybe they like doing it.
A:Maybe they think so.

当苹果削皮后,植物细胞中的酚类物质便在酚酶的作用下,与空气中的氧化合,产生大量的醌类物质.新生的醌类物质能使植物细胞迅速的变成褐色,这种变化称为食物的酶促褐变.所以苹果削皮放一会儿后会变色.不仅苹果梨子及有些蔬菜（如土豆、茄子等）也有这种情况.这中褐变影响了食物的外观,使外层的营养成分有所降低,但尚可食用.如果苹果削皮后放置时间较长,植物细胞在空气中氧化分解作用加剧,则苹果外层的营养物质分解较多,果胶物质在酶的作用下进一步分解为果胶酸和甲醇,使得果肉松散、湿润、变色、变味,甚至腐烂变质.最好的方法是：在削苹果之前用盐在表皮上搓一下 然后洗掉 再削苹果 这样削出来的苹果 不但不会氧化 而且比削完再用盐水泡能保存更长的时间 且没有咸味