国产高潮在线观看,精品尤物在线观看不卡,137肉体裸交XXXXX摄影

精英家教網(wǎng) > 初中地理 > 題目詳情

【題目】一船在燈塔C的正東方向8海里的A處，以20海里/時的速度沿北偏西30°方向行駛．

（1）多長時間后，船距燈塔最近?

（2）多長時間后，船到燈塔的正北方向?此時船距燈塔有多遠?(其中:162-82≈13．92)

【答案】(1)12分鐘后，船距燈塔最近；（2）此時船距燈塔有13.9海里.

【解析】試題分析：（1）作出圖象在直角三角形ACD中求得AD的長后除以速度即可求得時間；

（2）在直角三角形ACB中求得AB的長后除以速度即可求得時間，由勾股定理可求出此時船距燈塔的距離．

試題解析：(1)如圖所示，由題意可知，當船航行到D點時，距燈塔最近，

此時，CD⊥AB．

因為∠BAC=90°-30°=60°，所以∠ACD=30°．

所以AD==4(海里)．

又因為4÷20=0．2(小時)=12(分鐘)，

所以12分鐘后，船距燈塔最近．

(2)當船到達燈塔的正北方向的B點時， BC⊥AC．

此時∠B=30°，

所以AB=2AC=2×8=16(海里)．

所以16÷20=0．8(小時)=48(分鐘)．

所以BC2=AB2-AC2=162-82≈13． 92．

所以BC≈13．9(海里)．

即48分鐘后，船到燈塔的正北方向，此時船距燈塔有13.9海里．

練習冊系列答案

一線名師云南密卷系列答案

化學教與學系列答案

四川新教材新中考系列答案

系統(tǒng)分類總復(fù)習系列答案

新課標階梯閱讀訓(xùn)練系列答案

考前模擬預(yù)測試卷系列答案

同步詞匯訓(xùn)練系列答案

優(yōu)加學案創(chuàng)新金卷系列答案

單元自測系列答案

冠亞中考模擬試題系列答案

年級	高中課程	年級	初中課程
高一	高一免費課程推薦！	初一	初一免費課程推薦！
高二	高二免費課程推薦！	初二	初二免費課程推薦！
高三	高三免費課程推薦！	初三	初三免費課程推薦！
更多初中、高中輔導(dǎo)課程推薦,點擊進入>>

相關(guān)習題

科目：初中地理 來源： 題型：

【題目】英語課上，同學們正在討論在空閑時間做什么，假如你是李華，請你根據(jù)所給提示和要求，用英語寫一篇短文，談?wù)勀阍诳臻e時間的活動以及感受。

提示:

(1)What do you like to do when you are free?

(2)Why are you interested in these things?

(3)What can you get from them?

要求:

(1)短文須包括所有要點，可適當發(fā)揮。

(2)短文中不得出現(xiàn)真實的人名、校名和地名。

(3)詞數(shù)80個左右(開頭已給出，不計入總詞數(shù))。

I have a lot of things to do in my free time.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

查看答案和解析>>

科目：初中地理 來源： 題型：

【題目】 If you have a strong interest in a subject with several friends, you may want to start a club about it. By starting a club, you can share this common interest with them. You can also get some experience and this may help you a lot in the future. If you would like to do that, here are some good suggestions for you.

The most important requirement for starting a successful club is having a common interest with other students. With the common interest, they will be happy to join your club. This makes it easier to keep the club working well. So before starting a club, you must think about your common interest with other people.

You also need a teacher in your club. The teacher will start the first class and encourage students to join the club. You also need the teacher to be the advisor (顧問) for your club. When you are in trouble, you can ask the teacher for help.

When these things are ready, you need to choose your leader of the club. How do you choose the leader? You can discuss it with your club members. In the discussion, you also need to discuss the rules of the club with your partners so that each of the members can understand the rules better.

Do you want to be a top student and get good grades in your exams? You_can_follow_these_suggestions_and_start_your_club. Just do it.

1題完成句子；2～3題簡略回答問題；4題找出并寫下全文的主題句；5題將文中畫線句子譯成漢語。

【1】To start a successful club, the most important requirement is________________ with other students.

【2】Why do you need a teacher to be the advisor for your club?

________________________________________________________________________

【3】How do you choose the leader of your club?

________________________________________________________________________

【4】________________________________________________________________________

【5】________________________________________________________________________

查看答案和解析>>

科目：初中地理 來源： 題型：

【題目】 I have received many Christmas gifts over these years. The best gift I ever received was _______ by a stranger. I even never knew his name, and I only had contact with _______ for less than 60 seconds. His Christmas gift to me changed the way I think about people and Christmas.

I hate Black Friday sales. It's often a gathering of people who are there for many different reasons. Some are ______ one item for their loved one, or perhaps for themselves. Their intentions are completely unrelated to the happy time of a year, and can only be summed(總結(jié)) up with one word, “Cheap!”.

Several years ago, my mother asked me to meet her at the _______ market on Black Friday morning. She _______ to buy a bike for my brother. Many people were waiting for the selling. As the number of the bikes reduced, I knew I need to take one for my brother. I lifted up the box and _______ felt some mild resistance(阻力). A gentleman with Tattoos(紋身) made me feel _______.

I started to put the box back but he gently pushed it back into my _______ and directed it into my shopping cart. He looked at me, smiled and said, “Merry Christmas.” My mother and I went to the checkout, paid for the bike and went home.

On the way home I was thinking that this _______ was by far the best Christmas gift I had ever received. The kindness of a stranger ________ all preconceived(預(yù)想的) ideas. I will never forget it.

【1】A.givenB.gottenC.acceptedD.let

【2】A.youB.themC.himD.me

【3】A.leaving forB.asking forC.standing forD.caring for

【4】A.fullB.localC.specialD.dirty

【5】A.wantedB.allowedC.remindedD.solved

【6】A.silentlyB.quicklyC.politelyD.suddenly

【7】A.frightenedB.interestedC.relaxedD.bored

【8】A.legsB.armsC.eyesD.hands

【9】A.minuteB.momentC.troubleD.advice

【10】A.tookB.fixedC.madeD.changed

查看答案和解析>>

科目：初中地理 來源： 題型：

【題目】 There were two men who lived next to each other. One of them was a retired teacher and the other was a businessman. Both of them had planted many different plants in their gardens. The retired teacher seldom _____ his plants and didn't pay a lot of attention to them. But his neighbor was very _____ with his plants and watered them often.

The retired teacher's plants were small, but still looked okay, _____ the businessman's plants were much bigger and greener. One night, there came a storm with a heavy rain and strong wind. The next _____, both of the neighbors came out to check in their gardens. The businessman saw that his plants had come out from the _____ and were totally out of life. But the retired teacher's plants nicely _____ where they were.

The businessman was _____. He went to consult(咨詢) the retired teacher. “We both grew the same plants and I _____ my plants better than you did. How could your plants still be okay?”

The retired teacher smiled and said, “Because you gave your plants too much_____. You made it too easy for them to ______. I gave my plants just a little bit of water, so they had to grow deeper to absorb(吸收) more water. That is why my plants survived.”

【1】A.wateredB.raisedC.checkedD.caught

【2】A.happyB.carefulC.familiarD.tired

【3】A.beforeB.sinceC.unlessD.while

【4】A.eveningB.afternoonC.morningD.noon

【5】A.houseB.floorC.skyD.earth

【6】A.heardB.tookC.stoodD.thought

【7】A.surprisedB.interestedC.excitedD.moved

【8】A.called forB.left forC.cared forD.looked for

【9】A.inventionB.attentionC.invitationD.action

【10】A.growB.plantC.stopD.die

查看答案和解析>>

科目：初中地理 來源： 題型：

【題目】用方框中所給單詞的適當形式填空，使對話通順、正確。每詞僅用一次（每空一詞）

Now more and more children are 【1】 very heavy. Maybe there are two main 【2】 .

Firstly, there are too many shops around schools. The shops sell unhealthy food, such as fried chicken and ice cream at low prices. So some children don’t like to eat at home. If there were fewer of these shops, then probably children would buy 【3】 junk food.

Secondly, children have bad 【4】 habits. They like fast food. Today we can see McDonald’s and KFC everywhere. Many children are crazy about fast food. In fact, 【5】 of the fast food is unhealthy because it has too much salt and sugar.