㈠ (2004東城區二模)如圖所示,水平放置的兩個平行金屬板MN、PQ間存在勻強電場和勻強磁場.MN板帶正電,P
電荷所受的洛倫茲力Ff=qvB,當電荷的速度為零時,洛倫茲力為零,故電荷在I點和K點只專受到電場力的作用,屬故在這兩點的加速度大小相等.方向相同,①是正確的,②是錯誤的.
由於J點是曲線上離MN板最遠的點,說明電荷在J點具有與MN平行的速度,帶電粒子在J點受到兩個力的作用,即電場力和洛倫茲力;軌跡能夠向上偏折,則說明洛倫茲力大於電場力,故③正確.④是錯誤的,綜上所述,選項A正確的.
故選A
㈡ (2011東城區二模)如圖所示電路圖,把端點A、B接在電壓U不變的電源兩端,只閉合開關S1,電壓表的示數為
把端點A、B接在電壓U不變的電源兩端,只閉合開關S1,等效電路圖如圖所示;
把端點A、D接同一電源兩端,只閉合開關S1,等效電路圖如圖2所示;
把端點B、C接同一電源兩端,只閉合開關S2,等效電路圖如圖3所示;
由圖1可得:U1=I1R2=6V-------①
∵U1=6V,U1:U3=4:3,
∴U3=4.5V,
由圖2可得,I3R2=4.5V-------②
由①②兩式可得:
I1 |
I3 |
4 |
3 |
U2 |
R2 |
(30V)2 |
3Ω |
R2R3 |
R2+R3 |
3Ω×12Ω |
3Ω+12Ω |
㈢ (2014東城區二模)如圖,四棱錐E-ABCD中,平面EAD⊥平面ABCD,DC∥AB,BC⊥CD,EA⊥ED,且AB=4,BC=CD=
㈣ 翻譯中考英語閱讀文章:北京市東城區2012中考英語二模C 篇閱讀
Different colours can affect us in many different ways; that』s according to Verity Allen.
不同的顏色能以不同的方式影響我們,這話是維里蒂.艾倫說的。
In a new programme 「Colour me Healthy」, Verity looks at the ways that colours can influence how hard we work and the choices we make. They can even change our emotions and even influence how healthy we are.
在新節目「為我健康增色」中,維里蒂觀察色彩影響我們的方式方法,顏色影響我們工作的努力程度和我們做出的決定。它們甚至能改變我們的情緒,甚至能影響我們的健康程度。
「Have you ever noticed how people always use the same colours for the same things?」 says Verity. 「Our toothpaste is always white or blue or maybe red. It』s never green. Why not? For some reason we think that blue and white is clean, while we think of green procts(產品)as being a bit unpleasant.
「你是否曾注意過,人們總是同一種東西用同一款顏色,人們是怎樣做的呢?」維里蒂說,「我們的牙刷總是白色或藍色,又或許是紅色。但絕不是綠色。為何不是?因為某些原因,我們覺得藍色和白色是干凈的,而我們認為綠顏色的產品有些不讓人愉快。
It』s the same for businesses. We respect a company which writes its name in blue or black, but we don』t respect one that uses pink or orange. People who design設計new procts can use these ideas to influence what we buy.」
對企業來說,也是如此。我們尊敬以藍色或黑色書寫其名的公司,卻不尊敬將名字寫成粉色或橘色的公司。新產品的設計者可根據這些理念來影響我們所購買的東西。
During the programme, Verity studies eight different colours, two colours in each part.
在節目中,維里蒂研究八種不同的顏色,每兩種分為一組。
She meets people who work in the colour instry, from people who design food packages, to people who name the colours of lipsticks.
她拜訪那些在色彩領域工作的人,從食品包裝設計師,到唇膏色彩命名者。
Some of the people she meets clearly have very little scientific knowledge to prove their ideas, such as the American 「Colour Doctor」 who believes that serious diseases can be treated successfully by the use of coloured lights.
她見過的人中,有些明顯不具備科學的知識來證明他們的觀點,比如說一位美國色彩醫生,這位醫生相信嚴重的疾病能用彩色燈成功治癒。
However, she also interviews real scientists who are studying the effects of green and red lights on mice, with some surprising results.
但是,她也采訪那些真正的科學家,他們正在研究紅綠燈對老鼠的影響,並取得了一些出人意料的成果。
Overall, it』s an interesting show, and anyone who watches it will probably find out something new.
總之,這是一個有意思的節目,任何一位看節目的人或許都能在其中發現新的東西。
But because Verity goes out of her way to be polite to everyone she meets on the programme, it』s up to you to make your own decisions about how much you should believe.
然而出於維里蒂對每一位節目受訪者的禮貌,(受訪者的話)其可信度有多少,就取決於你自己了。
(最後一句話的言外之意:維里蒂只作采訪不作評論,觀眾自己看自己判斷真假。)
㈤ (2014東城區二模)如圖所示,放在水平地面上的杠桿AC能以B點為支點在豎直平面內轉動,AC=0.8m,BC=0.6m
(1)當墊塊D對物體H的支持力為時,物體E的質量最大.以杠桿為研究對象,受力分析如圖1甲所示;以動滑輪和物體E為研究對象,受力分析如答圖1乙所示;以物體H為研究對象,受力分析如答圖1丙所示.
㈥ 東城二模2010英語答案
第一部分:聽力理解(共三節,30分)
第一節(共5小題;每小題1.5分,滿分7.5分)
1—5 BAC AA
第二節(10小題,每小題1.5分,滿分15分)
6—10 CBBAC 11—15 CCABA
第三節(共5小題,每小題1.5分,滿分7.5分)
第小題1.5分。如出現拼寫錯誤不計分;出現大小寫、單復數錯誤扣0.5分。
16.12 17.choice 18.shoes 19.12:15 20.food/snacks
第二部分:知識運用(共兩節,45分)
第一節:單項填空(共15小題;每小題1分,滿分15分)
21—25 CBDAA 26—30 BDCCB 31—35 BCABB
第二節:完形填空(共20小題;每小題1.5分,滿分30分)
36—40 BDCDB 41—45 ABCAC 46—50 ABADC 51—55 ADBBA
第三部分:閱讀理解(共兩節,40分)
第一節(共15小題;每小題2分,滿分30分)
56—60 DABAC 61—65 ACADD 66—70 CDABC
第二節(共5小題;每小題2分,滿分10分)
71—75 GFEAB
第四部分:書面表達(共兩節,35分)
第一節 情景作文(20分)
一、評分原則:
1.本題總分為20分,按5個檔次給分。
2.評分時,先根據文章的內容和語言質量初步確定其檔次,然後以該檔冽的要求衡量,確
定或調整檔次,最後給分。
3.評分時應考慮:內容要點、上下文的連貫、詞彙和句式的多樣性及語言的准確性。
4.拼寫、標點或書寫影響內容表達時,應視其影響程度予以考慮。英、美拼寫及詞彙用法
均可接受。
5.詞數少於60,從總分中減去1分。
二、各檔次的給分范圍和要求:
第一檔 完全完成了試題規定的任務。
●覆蓋了所有內容要點;
●運用了多樣的句式和豐富的詞彙;
● 語言或用詞方面有個別錯誤,但為盡可能表達豐富的內容所致;體現了較強的語言運用能力;
●有效地使用了語句間的連接成分,所寫內容連貫、結構緊湊。
完全達到了預期的寫作目的。
18分一20分
第二檔 完全完成了試題規定的任務。
●覆蓋了所有內容要點;
●運用的詞彙和句式能滿足任務要求;
●語言和用詞方面基本准確,少許錯誤主要為盡可能表達豐富的內容所致;
●使用了簡單的語句間連接成分,所寫內容連貫。
達到了預期的寫作目的。
15分一17分
第三檔 基本完成了試題規定的任務。
●覆蓋了內容要點;
●運用的詞彙和句式基本滿足任務要求;
●語言和用詞方面有一些錯誤,但不影響理解。
基本達到了預期的寫作目的。
12分一14分
第四檔 未恰當完成試題規定的任務。
●漏掉或未描述清楚主要內容;
●所用句式和詞彙有限;
●語法或用詞方面的錯誤影響了對所寫內容的理解。
未能清楚地傳達信息。
6分一11分
第五檔 未恰當完成試題規定的任務。
●明顯遺漏主要內容;
●句式單調、詞彙貧乏;
●語法和用詞方面錯誤較多,嚴重影響了對所寫內容的理解。
未能傳達任何信息;所寫內容與要求無關。
1分一5分
0分 未能傳達任何信息;所寫內容與要求無關。
三、One possible version:
Dear Tim,
I』ve received your email, asking me about my plan for the summer vacation. Now let me tell you something exciting.
I』ve applied to be a volunteer for the World Expo 2010 Shanghai and I』ll start working as soon as I have finished the entrance examination.
The exposition is a grand intermational gathering, which is expected to attract 70 million visitors from both home and abroad. And what makes it unique is that it is being held in a developing country for the first time. Can you imagine how proud I feed to be able to do my bit for this special occasion?
Speaking of the volunteer work, I』ll mainly help out in Beijing Pavilion, where I will show the visitors around and introce the magnificent buildings to them, such as the Forbidden City, the Bird』s Nest and so on. It』ll be a good chance to help the visitors to get to know about the culture of Beijing. Apart form my work as a volunteer, I will certainly pay a visit to different pavilions., I won』t miss seeing the great inventions and achievements on display and I can experience different cultures as well as exchange ideas with people around the world. Sounds fantastic, doesn』t it?
I hope you can come and see it for yourself.
㈦ 2011年東城區二模英語答案出來了嗎
-20ABCBA BABAB ABCBC BCBCA
21-35BABDA ACBCB CACAC
36-55BDCAC BCADD BBCAD AADAB
56-75DBCAD BABAA CBCAC BBDDC
情景作文
One possible version:
The following is a survey about how young children go to school in the cities of Beijing,Tokyo and Seoul.From the survey we can see that about 75% of the Beijing children reach their schools within 20 minutes while in Tokoy and Seoul about 90% can manage this .As far as transpont is concerned ,all the children in Tokoy and Seoul go to school on foot while Beijing children take private cars,taixs and buses as well as walk.58.1% of the Beijing children are taken to and met at school by their parents while only about 3% of the Tokoy and Seoul children need help of this kind.They prefer to walk with friends.It seems children in Beijing are more dependent on their parents.
開放作文
One possible version:
@ means」at」,which is a sign used right in front of a certain address.This sign is used for e-mail.So I think it stands for the 」virtual world」in this picture,which is like a supermarket,huge and rich,where people are supposed to ask for and get anying they need.So logically,the fish stand for customers or people.On the one hand ,the 」fish」 need the t for food, on the other hand,they are cheated by the」fishermen」behind the t.That's how I understand it.Does it make sense?
㈧ (2014東城區二模)如圖,在△ABC中,AB=AC,AE是角平分線,BM平分∠ABC交AE於點M,經過B、M兩點的⊙O交
(1)AE與⊙抄O相切.
理由如下:
連接OM,則OM=OB,
∴∠OMB=∠OBM.
∵BM平分∠ABC,
∴∠OBM=∠EBM.
∴∠OMB=∠EBM.
∴OM∥BC.
∴∠AMO=∠AEB.
在△ABC中,AB=AC,AE是角平分線,
∴AE⊥BC.
∴∠AEB=90°.
∴∠AMO=90°.
∴OM⊥AE.
∴AE與⊙O相切;
(2)在△ABC中,AB=AC,AE是角平分線,
∴BE=
1 |
2 |
1 |
3 |
1 |
3 |
BE |
cos∠ABC |
OM |
BE |
AO |
AB |
r |
2 |
6?r |
6 |
3 |
2 |
3 |
2 |