日本成人片在线_久久免费精品视频_国产午夜精品久久久久久免费视_校花撩起jk露出白色内裤国产精品_av影片免费在线观看_国产小视频在线看_最新av免费在线观看_99久久99久久精品国产片_欧美成人猛片aaaaaaa_蜜桃免费网站一区二区三区

精英家教網 > 高中地理 > 題目詳情

【題目】小王在年初用50萬元購買一輛大貨車,第一年因繳納各種費用支出6萬元,從第二年起,每年都比上一年增加支出2萬元,假定該車每年的運輸收入均為25萬元.小王在該車運輸累計收入超過總支出后,考慮大貨車作為二手車出售,若該車在第年年底出售,其銷售價格為25-萬元(國家規定大貨車的報廢年限為10年).

(1)大貨車運輸到第幾年年底,該車運輸累計收入超過總支出?

(2)在第幾年年底將大貨車出售,能使小王獲得的年平均利潤最大(利潤=累計收入+銷售收入-總支出)?

【答案】(1)(2)

【解析】

試題分析:(1)設大貨車運輸到第年年底,該車運輸累計收入與總支出的差為元,則),令進而得出即可得到結論;(2)由利潤累計收入銷售收入總支出,得出年平均利潤為,即可利用基本不等式求解最值,得出結論.

試題解析:(1)設大貨車運輸到第年年底,該車運輸累計收入與總支出的差為元,則

,可得

,故從第三年,該車運輸累計收入超過總支持;

(2)利潤=累計收入+銷售收入-總支出,

二手車出售后,小王的年平均利潤為

當且僅當時,等號成立.

小王應當在第5年將大貨車出售,能使小王獲得的年平均利潤最大.

練習冊系列答案
相關習題

科目:高中地理 來源: 題型:

【題目】心理學中存在著許多有趣的倒U曲線,下圖就是表現壓力與工作績效關系的倒U曲線,請根據下圖寫出關于壓力與工作績效關系的兩條結論并給出一條建議。

答:________________________________________________________________________

________________________________________________________________________

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】閱讀理解。

A

Learning to speak English well may be the best thing you can do to improve your life. Thats right. If you can communicate in English, you can do the following things:

Contact (聯系) people from all over the world. Talk about your ideas and opinions on Internet discussion groups. Send e-mails to interesting people. Learn about their life and culture.

Travel more easily. Communicate with people wherever you goEnglish is spoken in more than 100 countries. Ask directions, have a conversation, or ask for help. Maybe English will save your life some day!

Push your career forward. If you want a good job in business, technology, or science, get out of that armchair and start learning English now! If you already have a good job, start learning before you lose it! Knowing English will let you do the following things:

Put “excellent knowledge of English” on your CV (履歷). Get your dream job, and earn more money.

Gain technical knowledge. English is the language of technology, especially high technology like computer science, and medicine. If youre going to read about technology, youll probably have to do it in English.

Be a world-class businessman or woman. Its simple. International business is done in English. And all business today is international. So if you want to play, you have to know Englishto contact other business people, go to conferences, and read international business newspapers and magazines, ect.

Become a better scientist. Contact scientists from other countries, go to international conferences, and visit research centers abroad. Learn about new scientific discoveries by reading papers, books, and magazines.

Use your computer more effectively. Most computer applications are in English, so you will understand them betterand become a better employee.

【1】According to the passage, which one is NOT the advantage of knowing English well?

A. Contacting people more easily.

B. Expressing your ideas clearly.

C. Traveling by spending less money.

D. Learning peoples life or culture.

2 Why does the author say English may save your life some day?

A. Because it enables you to get help from others.

B. Because it helps you gain more knowledge.

C. Because it enables you to tell directions to others.

D. Because it helps you lead a better life.

3 Whats the structure (結構) of the passage?

4What does the passage mainly convey?

A. Ways to learn English.

B. Ways to contact people.

C. Importance of gaining knowledge.

D. Benefits of learning English well.

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】2016年8月,廣東省公布了高考綜合改革試點方案,并從2018年秋季新入學的高一學生開始實施。新方案最大亮點是給學生多種選擇的機會,也因此給學生和家長帶來前所未有的挑戰。為此,廣東某地方報紙作了相關報道,并配發了下面這幅插圖,請仔細觀察,根據要求作答。(6分)

(1)簡要說明畫面內容。(2分)

(2)從這幅插圖的創意出發,揭示畫面的內涵。(4分)

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】假定英語課上老師要求同桌之間交換修改作文,請你修改你同桌寫的以下作文。文中共有10處語言錯誤,每句中最多有兩處。錯誤涉及一個單詞的增加、刪除或修改。

增加:在缺詞處加一個漏詞符號(∧),并在其下面寫出該加的詞。

刪除:把多余的詞用斜線(\)劃掉。

修改:在錯的詞下劃一橫線,并在該詞下面寫出修改后的詞。

注意:

1. 每處錯誤及其修改均僅限一詞;

2. 只允許修改10處,多者(從第11處起)不計分。

Last Sunday, my father go to see a film. But in our surprise, he came back soon. He told us about the funny thing what had happened. He was sitting in his seat while a woman came to her and said the seat was hers. So they looked at their tickets careful, only to find the seats were the same while the color were different. After while, my father apologized to the woman, saying, "Sorry, I make a mistake." The fact was that his ticket found out under the glass on his desk was for the film a month ago.

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】2015年11月13日,法國巴黎遭遇恐怖襲擊后,全世界人民以Pray For Paris的話題為巴黎祈福。下圖是傳播最廣泛的一張。請大家評述此圖的創意。(4分)

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】閱讀理解

閱讀下列短文,從每題所給的四個選項(ABCD中,選出最佳選項。

A city without cars would be very strange, right? But Venice is such a city.

Venice is in the northeast of Italy. It wasnt built on land, like Beijing or Shanghai, but on more than 110 islands. Seawater is everywhere around the city.

Even so, travel isnt difficult. The waterways have always been the best way to get around. There are 117 waterways and more than 400 bridges that can guide you where you want to go. People in Venice move from place to place by boat.

Water makes the city special, but it is also a big problem. Sometimes tourists will have such strange experiences. One moment they walk across the Rialto Bridge, and there’s nothing special. But when they come back to the bridge an hour later, it’s underwater and everyone is wearing rain shoes.

Once, people used too much underground water. This made the city get lower little by little. Now the city has gone down by 23 centimeters. Another problem is the rising seawater. The temperature has risen over the years. This has made the ice of the Arctic Ocean (北冰洋) melt (融化). Every year, high waters hit the city in autumn and winter. When a lot of water comes, more than half of the city is underwater.

Scientists are trying different ways to stop the city from getting even lower. The Italian government has asked some of Italy’s biggest companies to build the MOST project, which was planned to be build under the seawater to stop the rising water. Anyway, this project is helping solve the problem.

【1】Which is the best way to travel in Venice?

A. The waterways. B. Taxis and cars.

C. 400 bridges. D. Boats and rain shoes.

2What doesn’t cause Venice to get lower and lower?

A. The ice of the Arctic Ocean melt.

B. Seawater is everywhere around the city.

C. People used too much underground water

D. The temperature has become higher over the years.

3What can we infer from the last passage?

A. Venice is sure to stop getting lower.

B. High waters won’t hit Venice any more.

C. Scientists can solve the problems easily.

D. Some possible ways help to solve the problem.

4What’s the best title of this passage?

A. The History of Venice

B. The MOST Project of Venice.

C. The Places of Interest of Venice

D. The Specials and Problems of Venice

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】閱讀理解。

閱讀下列短文,從每題所給的四個選項(A、B、C和D)中,選出最佳選項。

Actually, long-distance bicycle camping is one of the most pleasurable activities I have ever experienced.

I generally sleep poorly at night, but in the woods on a tour, I sleep like a baby, falling asleep with the music of insects. In the morning, I am awakened by the cheeps of birds. I eat a snack before getting up, and then I quickly pack my sleeping bag, air mattress (墊), tent, and other things and get on with my road. I'm slower in the morning, having less speed but a greater desire to stop at pleasant spots and enjoy the beautiful scenery. Traveling by bike allows me to stop anywhere, such as grasslands, lakes, woods, and scenic spots. Near lunch, I find a small grocery and buy some bread, sandwiches and fruit. Then I will find a town park or other shady spots to wait out the high mid-day sun. In the afternoon, my speeds are higher, and I spend less time on stops. In the late afternoon, I start riding more slowly, and I start thinking about where I will stop. I finally find a place in the early evening, cook a simple meal and have a rest. As it starts to get dark, I put up my tent, crawl in and fall asleep.

There are exciting times and difficult times as well. Visiting strange or famous places and accomplishing goals are always exciting to me. I meet and talk with interesting people along the way, sometimes other traveling cyclists. Appreciating beautiful views, meeting wild animals, and traveling up and down hills also. On the other hand, I may run into a rainy or hot spell(一段時間), have to repair my bike, or just find myself in a bad mood. The problems are infrequent and are easy to deal with. The pleasures remain in my mind for years.

【1】We can learn from the passage that the author can have a good sleep ______.

A. in a hotel

B. at home

C. in the shade

D. in the woods

【2】 In the first paragraph, the author tells us that ________.

A. how he sleeps during his travel

B. the route of his bicycle travel

C. why he rides slowly all the time

D. one day’s activities of his bicycle travel

【3】It can be inferred from the first paragraph that the author ________.

A. enjoys a free and pleasant journey

B. likes riding in the woods

C. rides fast in the morning

D. cooks a simple lunch

【4】 According to the passage, a cycle tourist may prefer ________.

A. a beautiful view

B. a rainy day

C. a hot day

D. a strong wind

查看答案和解析>>

科目:高中地理 來源: 題型:

【題目】為了驗證木炭可被濃H2SO4氧化成CO2,選用如圖所示儀器(內含物質)組裝成實驗裝置:

(1)如按氣流由左向右流向,連接上述裝置的正確順序是(填各接口字母):________接________,________接________,________接________。

(2)儀器乙、丙應有怎樣的實驗現象才表明已檢驗出CO2?

乙中________________________,丙中________________________。

(3)丁中酸性KMnO4溶液的作用是__________________________________________。

(4)寫出甲中反應的化學方程式____________________________________________。

查看答案和解析>>

同步練習冊答案
91精品欧美福利在线观看| 三级资源在线| 国产性猛交96| 国产人妻精品午夜福利免费| 日韩精品人妻中文字幕| 中国黄色在线视频| a屁视频一区二区三区四区| 欧美第十八页| 成人黄色小视频在线观看| 欧美黑人做爰爽爽爽| 亚洲专区视频| 国产一区在线精品| 欧美性猛交xxxx偷拍洗澡| 精品国产区一区二区三区在线观看| 99爱精品视频| 在线免费视频a| 国产亚洲第一页| 日本高清中文字幕二区在线| 91麻豆精品一二三区在线| 国产日韩一区二区三区在线播放| 国产精品美日韩| 精品国产乱码久久| 成人美女免费网站视频| av天堂永久资源网| 国产女人被狂躁到高潮小说| 在线国产视频| 波多野结衣一区二区三区免费视频| 日韩不卡一区二区| 天天做天天摸天天爽国产一区| 日韩中文字幕国产精品| 欧美一区二视频在线免费观看| 手机看片国产精品| 国产精品久久久久久免费| caoporn视频在线| 欧美在线视屏| 亚洲色图一区二区三区| 中文在线不卡视频| 日本一区二区免费看| 裸体女人亚洲精品一区| 搡老女人一区二区三区视频tv| 蜜桃av噜噜一区二区三| 欧类av怡春院| 成人信息集中地欧美| 日本一区美女| 久久丫精品忘忧草西安产品| h精品动漫在线观看| 日韩中文字幕| 九九精品视频在线看| 欧美亚一区二区| 国产精品aaa| 91麻豆精品国产91久久久 | 我和岳m愉情xxxⅹ视频| 天天操天天操天天操| 高清成人免费视频| eeuss国产一区二区三区四区| 久久国产精品色婷婷| 少妇一级淫免费观看| 亚洲巨乳在线观看| 国产精品无码一区二区三区免费| 超碰免费在线观看| 久久精品免费| 亚洲精品97久久| 久操手机在线视频| 国产精品色综合| 综合色就爱涩涩涩综合婷婷| 精品日本高清在线播放 | 九七久久人人| 奇米影视一区二区三区小说| 亚洲欧美在线免费观看| 好吊妞无缓冲视频观看| 黄色小视频免费在线观看| 日韩伦理视频| 欧美放荡的少妇| 国产精品av免费| 亚洲一级黄色大片| 亚洲美女15p| 欧美性xxxxx| 欧美日韩国产免费一区二区三区| 国产专区第一页| 91成人噜噜噜在线播放| 亚洲成人手机在线| 精品视频导航| 日韩国产成人在线| 国产精品入口久久| 欧美调教femdomvk| 亚洲国产精品影视| 亚洲精品喷潮一区二区三区| 久久久久久久久久久9不雅视频| 欧美另类高清zo欧美| 中文字幕第一页亚洲| 亚洲AV无码国产精品午夜字幕| 免费av网站在线| 免费成人在线电影| 久久综合久久久久88| 国产成人免费91av在线| 国语自产精品视频在线看| 国产精品999视频| 粉嫩粉嫩芽的虎白女18在线视频| 亚洲精品男同| 国产亚洲美女精品久久久| 校园春色 亚洲色图| 成人在线观看一区| 国产大片一区二区| 97成人超碰免| 九九热久久免费视频| 成人综合网站| 亚洲一区二区五区| 日本欧洲国产一区二区| 99er热精品视频| 欧美激情综合| 一区二区三区www| 无套白嫩进入乌克兰美女| 中国av在线播放| 91亚洲资源网| 91香蕉嫩草影院入口| 久久国产精品系列| 欧美久久综合网| 精品少妇一区二区三区在线视频| 久久美女福利视频| 亚洲乱亚洲乱妇| av中文字幕在线不卡| 国产一区二区香蕉| 欧美性猛交bbbbb精品| 大色综合视频网站在线播放| 亚洲成avwww人| 999久久久精品视频| 日本大胆在线观看| 中文字幕一区二区三区蜜月 | 波多野结衣一本| 高清欧美日韩| 色婷婷国产精品| 国产精品久久中文字幕| www.久久热.com| 91片在线免费观看| 国产一区在线观| wwwxxxx国产| 日韩国产欧美在线观看| 韩国19禁主播vip福利视频| 日韩在线视频网址| 久久99国产成人小视频| 亚洲国产精品免费| 亚洲少妇中文字幕| 日本成人一区二区| 欧美日韩亚洲综合在线 欧美亚洲特黄一级| 欧美午夜性视频| 97电影在线观看| 国产欧美精品区一区二区三区| 久久久综合亚洲91久久98| 好吊色视频一区二区| 精品一区二区三区在线播放视频 | 成人在线影视| 国产精品福利影院| 亚洲一区美女| 九九九在线视频| 福利资源在线久| 久久精品一区| 热久久免费视频精品| 国产精品午夜影院| 91人妻一区二区三区蜜臀| 亚洲黄色网址| 欧美午夜影院在线视频| 波多野结衣家庭教师视频| 大桥未久在线播放| 五月激情综合色| 精品中文字幕av| 91豆花视频在线播放| 五月综合激情网| 国产免费成人在线| 色多多在线观看| 色诱视频网站一区| 亚洲性生活网站| 亚洲av毛片成人精品| 黄网在线免费看| 国产日产欧美一区二区三区| 日韩一区国产在线观看| 免费观看成年在线视频网站| 国产女人aaa级久久久级| 亚洲欧美日韩精品在线| www亚洲人| 亚洲精品水蜜桃| 欧美性受极品xxxx喷水| japanese在线视频| 国产网友自拍视频导航网站在线观看| 亚洲美腿欧美偷拍| 欧美一级片免费播放| av小说在线播放| 在线观看亚洲a| 99日在线视频| 亚洲婷婷久久综合| 日韩欧美一区免费| 欧美乱妇40p| 精品人妻一区二区三区潮喷在线| 久久看片网站| 91丨九色丨国产| 天天射综合网站| 中文字幕欧美激情| 美女扒开大腿让男人桶| 黄色av网站免费观看| 伊人久久在线| 欧美日韩国产大片| 朝桐光av一区二区三区| 竹菊久久久久久久| 欧美高清电影在线看| 五月天婷婷导航| 久久精品国内一区二区三区| 精品亚洲第一| 91亚洲一线产区二线产区| 久蕉在线视频| 一区二区视频在线| 精品少妇无遮挡毛片| 日本中文字幕视频一区| 精品视频在线播放| 久久网一区二区| 久久久精品性| 成人一区二区三区四区| 国精产品一区二区| 风流老熟女一区二区三区| 久久精品日产第一区二区三区高清版 | 成人免费小视频| 日韩视频免费在线播放| 久草福利资源在线观看| 51一区二区三区| 亚洲欧美另类国产| 亚洲国产成人精品激情在线| 久久精品久久99精品久久| 日韩动漫在线观看| 91禁在线看| 亚洲电影免费观看| 久久婷婷综合国产| 国内精品久久久久影院薰衣草 | 在线精品亚洲一区二区| 天堂√8在线中文| 亚洲国产天堂久久国产91| 麻豆91精品91久久久| 裸体一区二区三区| 在线不卡日本| 国产成+人+综合+亚洲欧美| 亚洲色图色老头| 无码人妻精品一区二区| 成人免费高清视频在线观看| 青青青在线视频播放| 免费精品一区二区三区在线观看| 久久影视电视剧免费网站| 99精品国产99久久久久久97| 国产天堂亚洲国产碰碰| 视色视频在线观看| 精品视频免费在线观看| 国产精品亚洲美女av网站| 黄网站在线观看| 在线精品视频一区二区| 2017亚洲天堂| 久久国产精品99精品国产| 在线观看国产一区| 成人毛片免费| 精品视频9999| 白白色在线发布| 六月丁香综合在线视频| 在线不卡一区二区| 精品成人av一区二区三区| 一道本一区二区| 日韩黄色影视| 国产精品久久亚洲不卡| 欧美深夜视频| 久久视频在线看| 十八禁一区二区三区| 午夜欧美视频在线观看| 精品无码国产污污污免费网站| 国产精品日本| 在线国产精品网| 精品国产一区二区三区性色av| 国模私拍视频一区| 污污软件在线观看| 韩国v欧美v亚洲v日本v| 久久精品99久久香蕉国产色戒| 中文字幕永久在线观看| 亚洲欧美怡红院| 在线观看亚洲免费视频| 另类av一区二区| 黄色网zhan| 国产成人tv| 国产精品视频免费在线观看| 精品孕妇一区二区三区| 91在线观看高清| 26uuu另类亚洲欧美日本一| 超碰在线电影| 欧美老肥妇做.爰bbww| 欧美三级一区二区三区| 国产三级一区二区三区| 最新版天堂资源在线| 久久精品日韩欧美| 隔壁人妻偷人bd中字| 国产剧情在线观看一区| 国产精品三区在线| 无人区在线高清完整免费版 一区二| 久久五月情影视| 五丁香在线视频| 日韩欧美一级二级| 91精品视频免费在线观看| 亚洲国产精品久久人人爱| 99精品中文字幕| 91在线一区二区| 国产原创剧情av| 激情都市一区二区| 深夜黄色小视频| 一区二区国产在线观看| 91网站在线观看免费| 国产日产精品一区二区三区四区的观看方式| 成人精品一二区| 日韩有码欧美| 国产裸体写真av一区二区| 美女视频在线免费| 国产综合在线看| 黄网站在线免费看| 久久久精品在线观看| 极品美乳网红视频免费在线观看| 国产丝袜精品第一页| 亚洲人成色777777老人头| 91精品国产91久久久久久一区二区| 久久久久精彩视频| 欧美日韩亚洲91| 国产尤物在线视频| 亚洲图片欧美一区| 日本一级淫片免费放| 亚洲美女区一区| 国产精品111| 亚洲另类中文字| 久久久久亚洲av成人片| 自拍视频在线观看一区二区| 国产1区2区3区4区| 中文字幕亚洲欧美在线不卡| 少妇高潮一区二区三区喷水| 国产欧美一区二区精品性| 日韩三级成人av网| 精品欧美一区二区精品少妇| 欧美日本一区二区在线观看| 国产一区二区麻豆| 欧美日韩中字一区| 97在线播放免费观看| 激情久久婷婷| 日本高清一区| 九九亚洲精品| 在线免费一区| 婷婷综合久久| 国产96在线 | 亚洲| 亚洲啪啪91| 中文字幕欧美人妻精品一区| 久久综合图片| 成人亚洲免费视频| 国产美女主播视频一区| 在线视频 日韩| 91免费观看国产| 国产一区二区三区视频播放| 中文字幕一区二区在线观看| 久久久久97国产| 精品国产91久久久久久老师| 欧美一级黄视频| 欧美日本乱大交xxxxx| 亚洲国产欧美另类| 亚洲精品美女网站| 国产在线资源| 久久久久亚洲精品| 日韩电影免费观| yy111111少妇影院日韩夜片| 农村少妇一区二区三区四区五区| 亚洲国产精品久久久久久女王| 久久久久国产精品| 国产日韩成人内射视频 | 日韩精品中午字幕| 在线观看中文字幕| 久久精品中文字幕一区| 国产三线在线| 成人xxxxx| 精品少妇一区| 一区二区三区一级片| 在线日韩电影| 欧美又黄又嫩大片a级| va亚洲va日韩不卡在线观看| 你懂得在线观看| 亚洲成人精品一区二区| 国产露脸91国语对白| 日韩国产一区三区| 麻豆网在线观看| 国产精品黄色av| av动漫精品一区二区| 自拍偷拍一区二区三区| 中文久久精品| 亚洲911精品成人18网站| 国产三区在线成人av| 成人免费视频毛片| 日韩欧美一级片| 亚洲精品承认| 国产精品国产三级国产专播精品人| 麻豆精品在线| 正在播放精油久久| 久久福利精品| 国产伦精品一区二区三区妓女| 亚洲欧美日韩在线| 国产模特av私拍大尺度| 国产香蕉97碰碰久久人人| 欧美大胆的人体xxxx|