㈠ (2013奉贤区二模)如图所示的电路,当开关S1断开,S2与2接通时,灯泡L1最亮,灯泡L2与L4的亮度相同,且
A、B由题,当复开关S1断开,制S2与2接通时,四个灯泡串联,电流都相同,由灯泡L1最亮,灯泡L2与L4的亮度相同,且最暗,可知,L1电阻最大,L2与L4的电阻相同,且最小;当开关S2与3接通、S1闭合时,L2与L1并联后另外两灯串联,L2与L1并联电压小于另外两个灯泡的电压,而L1电阻最大,由公式P=
U2 |
R |
UI |
EI |
U |
E |
㈡ (2013奉贤区二模)如图所示,一绝缘轻绳绕过无摩擦的两轻质小定滑轮O1、O2,一端与质量m=0.2kg的带正电
(1)设环受到重力为Gp,电场力为F,绳子拉力为T,对环受力分析如图,其中F=qE=4×10-5C×5×104N/C=2N.
由平衡条件得:Tcos37°+N1=(Gp+F)cos53°
代入数据得:N1=0.8N
㈢ (2013奉贤区二模)在图(a)所示的电路中,电阻R1的阻值为20欧,变阻器R2标有“20Ω 2A”字样,闭合电
(1)电阻R1的电压U1=I1R1=0.3A×20Ω=6V,
电阻R1与R2并联,接在电源两端,所以电源电压U=U2=U1=6V;
答:电源电压是回6V.
(2)由电路图知,电流表A1测支路R1电流,电流表A2测干路电流,
由题意可判断得出:图b所示电流表是串联在干路上的电流表A2,
且示数为I=0.7A,所以流过电阻R2的电流I2=I-I1=0.7A-0.3A=0.4A,
滑动变阻器接入电路的阻值R2=
U2 |
I2 |
6伏 |
0.4安 |
㈣ (2013奉贤区二模)我国北方某盐湖生产的纯碱(Na2CO3)产品中常含有少量的氯化钠(其它杂质忽略不计)
(1)设6克试样中含碳酸钠的物质的量为x
Na2CO3+CaCl2=CaCO3↓+2NaCl
11
x 0.05mol
1 |
x |
1 |
0.05mol |
0.05mol×106g/mol |
6g |
㈤ (2013奉贤区二模)为了探究二氧化硫的漂白作用到底是二氧化硫本身还是二氧化硫与水作用的产物,某学习
(1)该实验是探究干燥的SO2能不能使品红褪色,所以二氧化硫通入品红溶液前要进行干燥;二氧化硫有毒,所以多余气体不能直接排空,故要有尾气处理装置,
故答案为:①二氧化硫没有干燥(或缺少二氧化硫的干燥装置);②没有尾气吸收装置;
(2)二氧化硫和水反应生成亚硫酸,SO2+H2O?H2SO3,亚硫酸是二元弱酸,所以能发生两步电离,第一步生成氢离子和亚硫酸氢根离子,亚硫酸氢根离子电离生成亚硫酸根离子和氢离子,H2SO3?H++HSO3-,HSO3-?H++SO32-,以上反应都是可逆反应,所以存在的含有硫元素的微粒有(除二氧化硫外)H2SO3、HSO3-、SO3 2-,
故答案为:H2SO3、HSO3-、SO3 2-;
(3)亚硫酸钠和亚硫酸氢钠都是强碱弱酸盐,都能发生水解,水解反应方程式为:亚硫酸钠的水解,SO32-+H2O=HSO3-+OH-、HSO3-+H2O=H2SO3+OH-;亚硫酸氢钠的水解,HSO3-+H2O=H2SO3+OH-;通过水解方程式看出,无论亚硫酸钠还是亚硫酸氢钠都能水解生成亚硫酸,故该说法错误,
故答案为:不正确,因亚硫酸根离子和亚硫酸氢根离子都会水解生成亚硫酸;
(4)①亚硫酸钠和亚硫酸氢钠都能电离和水解,但水解是微弱的,电离程度大于水解程度;亚硫酸氢根离子能电离出亚硫酸根离子,但较弱,所以亚硫酸氢钠溶液中的亚硫酸根离子比亚硫酸钠溶液中的小;亚硫酸氢钠溶液中的亚硫酸氢根离子比亚硫酸钠溶液中的大;亚硫酸根离子的水解程度大于亚硫酸氢根离子的水解程度,且亚硫酸根离子的第二步水解更弱,所以亚硫酸氢钠溶液中的亚硫酸比亚硫酸钠溶液中的大,
故答案为:小;大;大;
②根据实验和分析,得出的结论是使品红褪色的微粒是亚硫酸根离子,
故答案为:使品红褪色的微粒是亚硫酸根离子.
㈥ (2013奉贤区二模)三根绳a、b、c长度都为l,a、b悬挂在天花板上,c的下端与质量为m=2kg物体相连,它们
解答:
㈦ 奉贤区中考语文二模卷(2012)答案
一、文言文(42分)
(一)(18分)
1.芳草萋萋鹦鹉洲2.星汉灿烂3.道是无晴却有晴.
4;向来枉费推移力5.率妻子邑人来此绝境6.意将隧入以攻其后也
(每空3分,一个错别字扣1分,扣完为止).
(二)(4.分)
7.飘忽缭绕的云霭雾气。(2分)8.,C(2分)
(三)(8分).
9.清(1分)姚鼐(1分)
10.天边云彩上有一线奇异的颜色,一会儿又变成五颜六色。(3分)
誓
11.D(3分)、
(四)(12分)
12,n)离开(2分)(2)对....。,感到奇怪(2分)
,13.(戴原礼)听说有一个医生医术非常离明,治病立即见效,于是亲自去察看情况.。
(3分):-
14.分不清医书的“锡”和“饧”两个字,指导病人煎药时将“加糖”说成“加锡”。(2分)
15.我们在工作和学习中不能自以为是、一知半解、不懂装懂,否则就会造成工作和学习
的失误。
我们不能不辨是非、听信传言、盲目从众,否则会给自己带来重大损失。(3分)
二、,现代文(48分).
(一)(20分)
16.(1)司马迁(1分),《陈涉世家》(1分)
(2)B(2分)
17.对比论证突出了对于读经典只有探索体味,才能读出经典的不同凡响之处
(4分)
18.为“仁”、“义”的道德理想而献身(的精神)(2分)例:略(2分)
.19.专一(1分)玩味(1分)致用(1分)层进(2分).
20.C(3分)
(二)(28分)
r
21.缭(2分)
22.交代了其他师傅都查不出漏水的原因,突出修理的难度大,也表现出“我”对这个水电师傅修理技术的怀疑;与下文水电师傅找出漏水症结并修理好水管形成对比,突出水电师傅修理技术的高超。(3分)
23.第一处:希望“我”能留他下来修理漏水问题而讨好“我”(2分)
.第二处:终于找到了漏水的原因而高兴(2分),,
三处:修理过程中不知不觉把“我”当徒弟使唤而感到不好意思(2分)
24..(1)木讷的水电师傅在修理水管时变得干练和自如(
3分)
(3)内向的小吃店老板做拉面时一招一式充满了阳刚之气(3分)
25.C(3分)
26.略。要点:感点明确,表述清晰,语言流畅(8分)
㈧ 2015高三二模化学奉贤区试卷答案
1-ABABD CDCAAC DB
16-20CABCB
21-25 DCBDC 26-30CBCDC
31-35 ADDBB 36-40DEFAC
41-45 ADBBC 46-50ACADB
51-55 BCCDA 56-60DDCBB
61. it 62.of
63. is 64.overlooking
65. became 66.which
67. the 68.geographical
69. equipped 70. that
短文改错:
71. Look back to ... Look → Looking
72. ... several days before ...
before → ago
73. ... I think reason ... reason前加the
74. But I believe ... But → And
75. ... make friends with ...
make → made
76. ... from other city ... city → cities
77. Most important ...
important → importantly
78. ... I shouldn't have ...
shouldn't → couldn't
79. ... wish everyone for ... 掉for
80. ... we take count. count → counts
One possible version:
Hi everyone! I'm Li Hua from Senior Three.Today I am glad to be running for chairman of the English Club. I think I'msuitable for the position. As monitor of my class, I have been thought highlyof by my classmates and teachers. I'm a good communicator and good atorganising activities. Most importantly, I can speak fluent English and oftencommunicate with foreigners.
If I'm lucky enough to be elected aschairman, I will try my best to arrange more activities and create a strongerEnglish atmosphere for us. I sincerely hope you will give me a chance and votefor me.
Thank you.
部解析
阅读理解:
A篇(艺术)
本文记叙文文章讲述乐队指挥Andersson音乐带入故事
21. D细节理解题由第二段末 I bought many recordings of the world's great orchestras andconctors and listened to them for hours on end知
22. C推理判断题由第三段What audiences do not see is all the work ... with the orchestra推断乐队指挥式表演前需要做准备工作
23. B推理判断题由第四段reads about the composer's life ... Her goal is to recreate themusic as the composer intended推断Andersson所解作曲家更再现音乐
24. D细节理解题由倒数第二段To help young musicians understand how to play the music, Anderssonmight tell them to ... 知
B篇(家庭、朋友与周围)
本文议论文作者认家注重孩赋忽略品格
25. C推理判断题由第段I'm having a lot of conflicting emotions第二段Maybe I'd be out therebragging with some moms if she was ... 及第三段But that's a lie. I prayed for better than normal. Maybe that's whyI feel terrible when ... 推断作者智力平平;听别妈妈夸耀自孩赋作者羞愧
26. C词义猜测题由第二段if she was reading on an eighth grade level instead of ... beingsome kind of combination of Gandhi and Mozart推断划线词意思奇才
27. B推理判断题由第四段she also cares about other people's feelings及文所举两例推断Violet善良孩
28. C细节理解题由段But no one brags about how nice their kid is ... stories of kindness知作者喜欢听关于孩品格故事
C篇(健康)
本文说明文文章介绍季节性敏加剧原缓解办
29. D推理判断题由第段The long winter with bitter cold temperatures delayed some trees ...the biggest cause of spring allergies推断气候变化即较冬季导致些树木延期授粉进导致量树木同段间授粉使季节性敏加剧
30. C细节理解题由第点建议So by peeling or cooking fruit, you can lessen or completely avoidany reaction知
31. A推理判断题由第二点建议Hair pastes cause the hair to become a pollen magnet推断美发产品吸引花粉
32. D细节理解题由第三点建议make sure you at least wash your face at night知
D篇(购物)
本文应用文文章则座椅电梯广告
33. D细节理解题由文A simple clear LED display shows the status of the stairlift知显示屏显示座椅电梯状况
34. B细节理解题由文章末EXPIRES October 31, 2015知201510月31前购买才能享受优惠
35. B文章处题通读全文知本文则关于座椅电梯广告
七选五:
题:情
本文议论文文章论述钱与快乐比
36. DD项与文oftenlong hours away from home ... richer financially相呼应
37. EE项针第段所提问题答;文People who earn a good living are often happier than people who livein poverty进步说明E项内容
38. FF项与文comfortablestandard相呼应;文Here inthe U.S., the standard falls around $75,000F项举例说明
39. AA项起承启作用引关于金钱快乐错误观念
40. CC项与文the ideathat life would be happier ... measurable happiness及文People who earned $50,000 wereonly 9 percent more content than those making $25,000相呼应
完形填空:
题:现代技术
本文说明文文章介绍款能接电手机
41. A42. D智能手机我已经变普遍(common)至于难(hard)想起前网络覆盖范围
43. B由第三段people to live in the moment及the minimum amount of connectedness推断Light Phone设计宗旨使使用尽能少(little)
44. B智能手机能给提供各种信息便利使用率高;Light Phone则使少用手机故款手机设计理念与主流趋势(trend)相反
45. C由文make a proct推断两位创办见面快决定要创造(create)种产品
46. A由文people to live in the moment推断两位创办想创造种帮助与外界断联系(disconnect)产品使受太外界干扰
47. C由第段末go against the ... 推断款新研发产品功能与智能手机功能相反(opposite)
48. A由文知新型产品使(allows)
49. D由第四段receive forwarded calls from your phone, which you leave at home知创办者始考虑手机留(leave)家
50. B由文doesn't have a screen at all推断款没屏幕装置应该(small)
51. B款装置(just)数字键盘
52. C手机留家使获片刻休息尽情享受(enjoy)周围世界
53. C由段your phone, which you leave at home in order to ... 及文for certain ... we don't really... 推断创办者说应该(shouldn't)使用智能手机
54. D由文like when taking your kid to the park or having dinner with yourwife推断处说某些刻(moments)
55. A文提某些刻手机留家说实际并需要(need)自脸谱网等通知
56. D由文wondering if someone's trying to ... in an emergency推断Light Phone使休息同用担(anxiety)别急事与自联系
57. D由第四段the ability to receive forwarded calls from your phone推断Light Phone使使用者转接打给智能手机电使用者必担需要紧急联系(reach)
58. C(if)享受机够吸引使用者随看智能手机所通知等
59. B由文and notifications推断处指自智能手机太紧急或重要信息故选emails
60. B由文isn't attractive enough推断使用者随能够看自智能手机电邮件通知像给使用者款待(treat)
语填空:
61. it考查代词设空处指代文the closest U.S. port city to Europe故填it
62. of考查介词consist of固定短语意由……组
63. is考查般现由前句知设空处描述客观事实故填is
64. overlooking考查词-ing形式作定语用peninsulas与overlook(俯瞰)间逻辑主谓关系且overlook所表示作进行故填overlooking
65. became考查般由in the 18th century知become所表示作发故填became
66. which考查关系词设空处引导非限制性定语句指代前面整主句内容故填which
67. the考查定冠词序数词前要加定冠词the
68. geographical考查形容词作定语用设空处修饰名词position故填形容词geographical
69. equipped考查词作定语用equip与ships间逻辑宾关系且equip所表示作已完故填equipped
70. that考查连接词设空处引导宾语句且句缺故填that
㈨ 2013学年奉贤区初三语文二模卷答案
(一)
1、空山新雨后,天气晚来秋。
2、锦帽貂裘,千骑卷平冈。
稍等,正在回答中