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2018河北保定二模成绩

发布时间: 2020-12-03 09:18:27

⑴ (2014保定二模)甲乙两组小白鼠在不同温度下进行了实验,得到结果如图.下列分析不正确的是()A.

A、该实验的目的是探究下丘脑在体温调节中的作用,A错误;
B、甲组小白鼠为对照组内,因随着环境温度升高容,耗氧量减少,产热减少,说明体温调节正常,B正确;
C、乙组小白鼠体温随外界升高而耗氧量增加,说明体温调节不正常,随外界变化而改变,可能被切除了下丘脑,C正确;
D、实验前的甲乙两组小鼠的生长状况应该良好且相同,D正确.
故选:A.

⑵ (2014保定二模)已知△ABC是边长为3的等边三角形,点D、E分别是边AB,AC上的点,且满足ADDB=CEEA=12.

解答:证明:(1)因为等边△ABC的边长为3,且

AD
DB
=
CE
EA
=
1
2

所以AD=1,AE=2.在△ADE中,∠DAE=60°,
由余弦定理得=

⑶ (2014保定二模)已知△ABC是边长为3的等边三角形,点D、E分别是边AB、AC上的点,且满足ADDB=CEEA=12.

(Ⅰ)证明:因为等边△ABC的边长为3,且

AD
DB
=
CE
EA
=
1
2

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

⑷ 2012保定初中毕业生英语二模答案

保定市2012年初中毕业生第二次模拟考试
九年级理科综合试卷参考答案
一、单选题(本大题共22个小题;每小题2分,共44分。在每小题给出的四个选项中,只有一个选项符合题意)
题号 1 2 3 4 5 6 7 8 9 10 11
答案 A C A B B C D D A C B
题号 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、填空及简答题(本大题共9个小题;第24小题3分,其余小题每空1分,共34分)
23.(1)被撞物体移动距离的长短
(2)使小球到达水平面时具有相同的速度
(3)投掷出去的实心球在下落的过程中能量如何转化?
重力势能转化为动能
24.光的反射 右图 小
25.使电热水壶的金属外壳与地线相连 3.36×105 93.3%
26.(1)S 2000
(2)110
(3)上端N极
27.灯火 92.6% 90
28.(1)AB
(2)CO2
(3)1.5×108
29.(1)元素
(2)真空包装(其他合理答案也可)
(3)+6 煮沸
(4)铁比铜活泼
(5)凝固点降低
30.(1)无色酚酞试液变红
(2)加入酸碱指示剂(其他合理答案也可)
(3)Ca(OH)2+NaCO3 CaCO3↓+2NaOH
(4)二氧化碳(或按物质分类补充合理也可)
31.(1)H2O
(2)H2SO4+Fe=FeSO4+H2↑(其他合理答案也可)
(3)置换反应
(4)湿法炼铜(其他合理答案也可)
三、实验探究题(本大题共4个小题;第32小题4分,第33小题5分,第34小题8分,第35小题7分,共24分)
32.略(只要合理即得分)
33.(1)质量 甲
(2)加热时间 被加热的物质在相同时间内吸收的热量相同
(4)不正确,因为蒸发不受温度限制晚间海水也会蒸发
34.(1)略
(2)R2略(与实物图一致)
(3)灯丝断路
(4)0.4 1.52
实验拓展:(2分)
35.2NaOH+CO2 Na2CO3+H2O
【交流讨论】
(1)偏小 在水面上覆盖一层植物油(其它合理答案也可)
(2)(答其中一点或其他合理答案均可)
①产生的CO2气体中混有水蒸气,同时被碱石灰吸收 导致结果偏大
②反应结束后装置内残留的CO2气体不能全部排出 导致结果偏小
③球形干燥管与空气相通,也会吸收空气中的CO2和蒸气 导致结果偏大
【拓展探究】
(1) 过滤
(2) 向溶液M中继续滴加CaCl2溶液,若无沉淀说明CaCl2溶液已过量
四、计算应用题(本大题共3个小题;第36小题5分,第37小题6分,第38小题7分,共18分。解答时,要求有必要的文字说明、公式和计算步骤等,只写最后结果不得分)
36.(1)6
(2)解:设这10mL食醋样品中CH3COOH的质量为x
NaOH的质量为: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:该市售食醋符合国家标准。
37.(1)略
(2)F1L1=F2L2= = =400N
(3) P=
(4)
38.(1)U0=R0×I=30 ×0.3A=9V U热=U-U0=20V-9V=11V
P热=U热I=11V×0.3A=3.3W
(3) 电压表示数最大值U=15V,此时U热最大=U-U最大=20V-15V=5V
电流为I′=
此时热敏电阻的最小值为R最小=
对照表格可知当热敏电阻为10 时,对应的温度值为120℃

⑸ (2014保定二模)在光滑的水平面上有一质量为2m的盒子,盒子正中间有一质量为m的物体,如图所示,物体与

(1)设m在盒内滑行的时抄间为t,对m滑行过程应用动量定理:?μmgt=m

v0
2
?mv0
解得:t=
v0
2μg

(2)设碰后速度为v,物体与盒子组成的系统合外力为0,设向右为正方向,由动量守恒:
mv0=(m+2m)v
解得:v=
v0
3

(3)设盒子在碰前的速度为v1,对盒子与物块应用动量守恒定律:
mv0=m
v0
2
+2mv1
解得:v1=
v0
4

碰前盒子与物块的机械能:E1=
1
2
m(
v0
2
2+
1
2
?2m?v12=
3
16
mv02
碰后盒子与物块的机械能:E2=
1
2
(m+2m)v2=
1
6
mv02
物体与盒子碰撞过程中损失的机械能:△E=E1-E2=
1
48
mv02
答:(1)物体在盒内滑行的时间为
v0
2μg

(2)物体与盒子碰后的速度为
v0
3

(3)物体与盒子碰撞过程中损失的机械能
1
48
mv02

⑹ (2014保定二模)根据如图提供的某生态系统图,回答问题.(1)图中B为______气体.(2)该图中共有____

(1)图中树、蝗虫、虫和鸟都会通过呼吸作用产生二氧化碳.
(2)食物链是指生产者和消回费者之间的吃与答被吃的关系,图中的食物链是:树→蝗虫→鸟;树→虫→鸟.
(3)淀粉、脂肪、蛋白质是大分子物质,必须经过消化才能被人体吸收,淀粉是在口腔内被初步消化,在小肠内被最终消化为葡萄糖;蛋白质是在胃中被初步消化,在小肠内被最终消化为氨基酸;脂肪在胆汁的乳化下最终在小肠内被消化成甘油和脂肪酸.
(4)图中缺少分解者.
故答案为:(1)二氧化碳;
(2)2;
(3)蛋白质;
(4)分解者

⑺ (2014保定二模)二次函数y=ax2+bx+c的图象如图所示,那么下面结论:①abc>0,②2a+b=0;③a+b+c>0;

①∵二次函数图象开口向上,
∴a>0,
∵与y轴的负半轴相交,
∴c<0,
又∵对称轴版x=-

b
2a
=1,
∴b=-2a<0,
∴abc>权0,故本小题正确;
②由①可知,b=-2a,即2a+b=0,故本小题正确;
③由图象可知,x=1时y<0,即a+b+c<0,故本小题错误;
④∵抛物线与x轴交于(-1,0),对称轴为直线x=1,
∴抛物线与x轴的另外一个交点为交于(3,0).
将(3,0)代入y=ax2+bx+c,得9a+3b+c=0,故本小题正确.
故选C.

⑻ (2014保定二模)如图所示,A、B两物体之间用轻质弹簧连接,且与水平面之间的动摩擦因数均为μ.现用水

对整体分析,根据牛顿第二定律得:a=

F?μ(mA+mB)g
mA+mB
=
F
mA+mB
?μg,
隔离对B分析,根据牛顿第二定律得:内容F-μmBg=mBa,
解得:F弹=
mBF
mA+mB

增大两物体间的距离,知弹簧的弹力变大.
A、增大A物体的质量,弹力变小,两物体间的距离变小.故A错误.
B、增大B的质量,根据F弹=
F
mA
mB
+1
知,弹力增大,则两物体之间的距离变大.故B正确.
C、增大水平拉力,弹力变大,则两物体间的距离变大.故 C正确.
D、把水平面改成光滑的,则有:a=
F
mA+mB

A、B间的弹力为:F弹=mBa=
mBF
mA+mB
.故D错误.
故选:BC.

⑼ 保定初中二模 很重要

根本不是,我复当年的老制师也是这么忽悠我们的
不是,以你的中考成绩为准,如果看这个成绩,那就太不公平了,判卷什么的不公平,而且很容易有猫腻,大家能干吗
但如果你想和学校签合同(提前录取好学生),就要看那个成绩

⑽ 2012保定二模英语答案

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

听力材料: 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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