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2018河北保定二模成績

發布時間: 2020-12-03 09:18:27

⑴ (2014保定二模)甲乙兩組小白鼠在不同溫度下進行了實驗,得到結果如圖.下列分析不正確的是()A.

A、該實驗的目的是探究下丘腦在體溫調節中的作用,A錯誤;
B、甲組小白鼠為對照組內,因隨著環境溫度升高容,耗氧量減少,產熱減少,說明體溫調節正常,B正確;
C、乙組小白鼠體溫隨外界升高而耗氧量增加,說明體溫調節不正常,隨外界變化而改變,可能被切除了下丘腦,C正確;
D、實驗前的甲乙兩組小鼠的生長狀況應該良好且相同,D正確.
故選:A.

⑵ (2014保定二模)已知△ABC是邊長為3的等邊三角形,點D、E分別是邊AB,AC上的點,且滿足ADDB=CEEA=12.

解答:證明:(1)因為等邊△ABC的邊長為3,且

AD
DB
=
CE
EA
=
1
2

所以AD=1,AE=2.在△ADE中,∠DAE=60°,
由餘弦定理得=

⑶ (2014保定二模)已知△ABC是邊長為3的等邊三角形,點D、E分別是邊AB、AC上的點,且滿足ADDB=CEEA=12.

(Ⅰ)證明:因為等邊△ABC的邊長為3,且

AD
DB
=
CE
EA
=
1
2

所以AD=1,AE=2.在△ADE中,∠版DAE=60°,
由餘弦定理得DE=

⑷ 2012保定初中畢業生英語二模答案

保定市2012年初中畢業生第二次模擬考試
九年級理科綜合試卷參考答案
一、單選題(本大題共22個小題;每小題2分,共44分。在每小題給出的四個選項中,只有一個選項符合題意)
題號 1 2 3 4 5 6 7 8 9 10 11
答案 A C A B B C D D A C B
題號 12 13 14 15 16 17 18 19 20 21 22
答案 D B A A C D D D C A D
二、填空及簡答題(本大題共9個小題;第24小題3分,其餘小題每空1分,共34分)
23.(1)被撞物體移動距離的長短
(2)使小球到達水平面時具有相同的速度
(3)投擲出去的實心球在下落的過程中能量如何轉化?
重力勢能轉化為動能
24.光的反射 右圖 小
25.使電熱水壺的金屬外殼與地線相連 3.36×105 93.3%
26.(1)S 2000
(2)110
(3)上端N極
27.燈火 92.6% 90
28.(1)AB
(2)CO2
(3)1.5×108
29.(1)元素
(2)真空包裝(其他合理答案也可)
(3)+6 煮沸
(4)鐵比銅活潑
(5)凝固點降低
30.(1)無色酚酞試液變紅
(2)加入酸鹼指示劑(其他合理答案也可)
(3)Ca(OH)2+NaCO3 CaCO3↓+2NaOH
(4)二氧化碳(或按物質分類補充合理也可)
31.(1)H2O
(2)H2SO4+Fe=FeSO4+H2↑(其他合理答案也可)
(3)置換反應
(4)濕法煉銅(其他合理答案也可)
三、實驗探究題(本大題共4個小題;第32小題4分,第33小題5分,第34小題8分,第35小題7分,共24分)
32.略(只要合理即得分)
33.(1)質量 甲
(2)加熱時間 被加熱的物質在相同時間內吸收的熱量相同
(4)不正確,因為蒸發不受溫度限制晚間海水也會蒸發
34.(1)略
(2)R2略(與實物圖一致)
(3)燈絲斷路
(4)0.4 1.52
實驗拓展:(2分)
35.2NaOH+CO2 Na2CO3+H2O
【交流討論】
(1)偏小 在水面上覆蓋一層植物油(其它合理答案也可)
(2)(答其中一點或其他合理答案均可)
①產生的CO2氣體中混有水蒸氣,同時被鹼石灰吸收 導致結果偏大
②反應結束後裝置內殘留的CO2氣體不能全部排出 導致結果偏小
③球形乾燥管與空氣相通,也會吸收空氣中的CO2和蒸氣 導致結果偏大
【拓展探究】
(1) 過濾
(2) 向溶液M中繼續滴加CaCl2溶液,若無沉澱說明CaCl2溶液已過量
四、計算應用題(本大題共3個小題;第36小題5分,第37小題6分,第38小題7分,共18分。解答時,要求有必要的文字說明、公式和計算步驟等,只寫最後結果不得分)
36.(1)6
(2)解:設這10mL食醋樣品中CH3COOH的質量為x
NaOH的質量為:6g×5%=0.3g
CH3COOH+NaOH CH3COONa+H2O
60 40
x 0.3g
60:x=40:0.3g
x=0.45g
0.45g÷10mL×100mL=4.5g
答:該市售食醋符合國家標准。
37.(1)略
(2)F1L1=F2L2= = =400N
(3) P=
(4)
38.(1)U0=R0×I=30 ×0.3A=9V U熱=U-U0=20V-9V=11V
P熱=U熱I=11V×0.3A=3.3W
(3) 電壓表示數最大值U=15V,此時U熱最大=U-U最大=20V-15V=5V
電流為I′=
此時熱敏電阻的最小值為R最小=
對照表格可知當熱敏電阻為10 時,對應的溫度值為120℃

⑸ (2014保定二模)在光滑的水平面上有一質量為2m的盒子,盒子正中間有一質量為m的物體,如圖所示,物體與

(1)設m在盒內滑行的時抄間為t,對m滑行過程應用動量定理:?μmgt=m

v0
2
?mv0
解得:t=
v0
2μg

(2)設碰後速度為v,物體與盒子組成的系統合外力為0,設向右為正方向,由動量守恆:
mv0=(m+2m)v
解得:v=
v0
3

(3)設盒子在碰前的速度為v1,對盒子與物塊應用動量守恆定律:
mv0=m
v0
2
+2mv1
解得:v1=
v0
4

碰前盒子與物塊的機械能:E1=
1
2
m(
v0
2
2+
1
2
?2m?v12=
3
16
mv02
碰後盒子與物塊的機械能:E2=
1
2
(m+2m)v2=
1
6
mv02
物體與盒子碰撞過程中損失的機械能:△E=E1-E2=
1
48
mv02
答:(1)物體在盒內滑行的時間為
v0
2μg

(2)物體與盒子碰後的速度為
v0
3

(3)物體與盒子碰撞過程中損失的機械能
1
48
mv02

⑹ (2014保定二模)根據如圖提供的某生態系統圖,回答問題.(1)圖中B為______氣體.(2)該圖中共有____

(1)圖中樹、蝗蟲、蟲和鳥都會通過呼吸作用產生二氧化碳.
(2)食物鏈是指生產者和消回費者之間的吃與答被吃的關系,圖中的食物鏈是:樹→蝗蟲→鳥;樹→蟲→鳥.
(3)澱粉、脂肪、蛋白質是大分子物質,必須經過消化才能被人體吸收,澱粉是在口腔內被初步消化,在小腸內被最終消化為葡萄糖;蛋白質是在胃中被初步消化,在小腸內被最終消化為氨基酸;脂肪在膽汁的乳化下最終在小腸內被消化成甘油和脂肪酸.
(4)圖中缺少分解者.
故答案為:(1)二氧化碳;
(2)2;
(3)蛋白質;
(4)分解者

⑺ (2014保定二模)二次函數y=ax2+bx+c的圖象如圖所示,那麼下面結論:①abc>0,②2a+b=0;③a+b+c>0;

①∵二次函數圖象開口向上,
∴a>0,
∵與y軸的負半軸相交,
∴c<0,
又∵對稱軸版x=-

b
2a
=1,
∴b=-2a<0,
∴abc>權0,故本小題正確;
②由①可知,b=-2a,即2a+b=0,故本小題正確;
③由圖象可知,x=1時y<0,即a+b+c<0,故本小題錯誤;
④∵拋物線與x軸交於(-1,0),對稱軸為直線x=1,
∴拋物線與x軸的另外一個交點為交於(3,0).
將(3,0)代入y=ax2+bx+c,得9a+3b+c=0,故本小題正確.
故選C.

⑻ (2014保定二模)如圖所示,A、B兩物體之間用輕質彈簧連接,且與水平面之間的動摩擦因數均為μ.現用水

對整體分析,根據牛頓第二定律得:a=

F?μ(mA+mB)g
mA+mB
=
F
mA+mB
?μg,
隔離對B分析,根據牛頓第二定律得:內容F-μmBg=mBa,
解得:F彈=
mBF
mA+mB

增大兩物體間的距離,知彈簧的彈力變大.
A、增大A物體的質量,彈力變小,兩物體間的距離變小.故A錯誤.
B、增大B的質量,根據F彈=
F
mA
mB
+1
知,彈力增大,則兩物體之間的距離變大.故B正確.
C、增大水平拉力,彈力變大,則兩物體間的距離變大.故 C正確.
D、把水平面改成光滑的,則有:a=
F
mA+mB

A、B間的彈力為:F彈=mBa=
mBF
mA+mB
.故D錯誤.
故選:BC.

⑼ 保定初中二模 很重要

根本不是,我復當年的老制師也是這么忽悠我們的
不是,以你的中考成績為准,如果看這個成績,那就太不公平了,判卷什麼的不公平,而且很容易有貓膩,大家能幹嗎
但如果你想和學校簽合同(提前錄取好學生),就要看那個成績

⑽ 2012保定二模英語答案

參考答案 A卷 聽力:---5 CBAAB 6---10 BCAAB 11---15 CACBB 16---20 ABCBA 單選: 21---25 BACCB 26---30 ABDCC 31---35CDACD 完形:36---40 CBABD 41---45 DABCA 46---50 CDDBC 51---55 ADBCD 閱讀:56---60 BDAAC 61---65 CBCBD 66---70 ACCAB 71---75 CEDBF
B卷 聽力:1---5 ABCAB 6---10 BCAAB 11---15 CACBB 16---20 ABBCA 單選: 21---25 CACBB 26---30 ACDCB 31---35CDADC 完形:36---40 CBABD 41---45 DABCA 46---50 CDDBC 51---55 ADBCD 閱讀:56---60 BDAAC 61---65 CBCBD 66---70 ACCAB 71---75 CEDBF

Dear Sri/Madam, I read your advertisement on the Internet and I would like to apply for the position of a part-time tourist guide. I am a boy/girl of 18. I have a good knowledge of English and I』m excellent at speaking it, so there will be no trouble for me communicating with foreigners. What』s more, I know well about the famous national places of interest as well as the well-known resorts. Besides, I』m open-minded and it is easy for me to get along well with others. When tourists are in trouble I will be ready to help them. Thanks for your consideration. I would be more than happy to be employed. Looking forward to your reply. Yours, Li Hua

聽力材料: Text 1 M: Jessie, what are you doing? W: I』m reading an interesting book about wild animals. M: Oh, I wonder if it is the same book I read last weekend. Text 2 W: Hello, is there a place I can use the Internet? M: Yes, indeed. There』s an Internet Café on the ground floor. They are $2 for ten minutes. Text 3 W: Your classmate Prince is excellent. He was first in the national maths competition. M: Yes, he』s very clever. But he is a person of few words. Text 4 M: What was it like working with those young girl stars? W: It was a great group. There were never any fights. We had a wonderful time. Text 5 M: It』s that time of the month again — time to pay the rent. W: Yeah, and I』m really broken now. M: Well, you need to tighten your belt just like me. Text 6 M: Uh, excuse me, Professor Muse? W: Oh, yes, Arnold, come in. M: You asked to see me after class? W: Yes, I did, Arnold. I just wanted to have a few words with you about your performance in class lately. Your last three test scores have been very disappointing. M: I know I have let you down. I will study much harder this semester. W: Well, I』m glad to hear that, Arnold, because if you don』t improve, you will not be able to get a B or above for the final exam. Text 7 W: We are going to put on a performance. M: Really? When? W: It』s only three days away----On May 4. We have been preparing for it for two months. M: Where are you going to put it on? At the Youth Square? W: No. At the People』s Theatre. M: What are you doing that for? W: We want to collect money for poor children in the mountainous areas. M: That sounds great. Good luck to you. W: Thanks a lot. Text 8 W: Hello, Mark. I』m the reporter from Sports Weekly. May I ask you some questions? M: Please go ahead. W: What makes you take part in such a long race? M: I have confidence in my strength. I manage to do some exercise every day. W: Do you mean that regular exercise contributes to your good health? M: Sure. Young people nowadays watch games on television and read about sports in the newspaper or on the Internet and state that they love sports. I can』t see any good of that. W: I am one of them. What shall I do? M: A human being is a kind of machine that wears out from lack of use. You can start with some easy movements, such as jogging. W: Shall I stick to one exercise? M: You can, but your general fitness level is likely to increase through different activities. W: Thank you. And I hope I can see you in the race next year. Text 9 M: Well, what』s on TV tonight? W: Ur, there is a rerun of Star Wars. M: Nah, I』ve seen it a billion times. I』d like to see something different. W: Okay, let』s see here. Oh, on channel 2 at 9:00, there』s a home improvement show about fixing anything around the house. We do have a few things that you could repair in the bathroom. M: Fixing things? Uh, I think I』m going to bed. I have to get up early tomorrow. W: Okay. Too bad, though. There』s a basketball game on right now, but I guess you can catch the score in tomorrow』s newspaper. M: Oh, okay. I』ll stay up and keep you company while I, I mean, We watch the game. W: I thought you』d change your mind. Text 10 Hello, everyone. I』d like to tell you something about the student clubs in our school. Let』s begin with our reading club. It was first started in 1968, and has 90 members now. Every Thursday afternoon, they gather together to exchange their ideas on books. And you may join them to share your views. If you are a music lover, come to our music club. This club has a total of 85 members who usually meet on Saturday. Sometimes they go to the concerts together and sometimes they give performances themselves. For those who enjoy outdoor sports, the bicycle club can be a good choice. Trips are usually organized on Wednesday and last at least two hours. Together with 50 cyclists, you can not only see the beautiful nature, but also make yourself stronger. Of course, there are also many other clubs in our school. For more information, please go to the school website.

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