0  315343  315351  315357  315361  315367  315369  315373  315379  315381  315387  315393  315397  315399  315403  315409  315411  315417  315421  315423  315427  315429  315433  315435  315437  315438  315439  315441  315442  315443  315445  315447  315451  315453  315457  315459  315463  315469  315471  315477  315481  315483  315487  315493  315499  315501  315507  315511  315513  315519  315523  315529  315537  447090 

3.读数方法:

用各种测量仪器测量有关物理量,读数时首先要弄清测量仪器的精度.以螺旋测微器为例:精度为mm=0.01mm,其读数方法是:读数=固定刻度数(含半毫米刻度)+可动刻度数(含估读刻度数)×精度.

[典例分析]

[例1]  请将下列各种测量仪器的读数填在题中的横线上.  

示数___________cm           示数__________cm
 

示数___________s            示数__________s
 

电阻箱连入电路中的
电阻为___________Ω
 
此时待测电阻为___________Ω
 

用0-15V档,此电压
表示数为___________V
 
用0-0.6A档,此电流
表示数为___________A
 

[特别提示]  一般来说,除游标卡尺、秒表、电阻箱外,其他测量仪器的读数都需要估读,即读到精度的下一位. 

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2.在力学和电学实验中,常需要利用测量工具直接测量基本物理量.

 
基本物理量
测量仪器
力学
长度
刻度尺、游标卡尺、螺旋测微器
时间
秒表(停表)、打点计时器
质量
天平
电学
电阻(粗测)
欧姆表、电阻箱
电流
电流表
电压
电压表

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[方法归纳]

1.要求会正确使用的仪器

刻度尺、游标卡尺、螺旋测微器、天平、秒表、打点计时器、弹簧秤、温度表、电流表、电压表、多用电表、滑动变阻器、电阻箱、示波器.

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23.下面这则消息比较费解,请你用一组较短的句子把它简明清晰的表述出来。(可调整语序、适当增减词语)  (4分)

     著名学者专家们通过论证,证明了很多人对水利工程人员提出的在长江三峡修建大型水利发电站的可行性报告进行论证后得出的不可行意见是不科学的。

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.语言综合运用(9分)

22.下面的一则广告,有五处语言方面的毛病,请从原文中找出三处并加以修改。(6分)   

《狂飙英语》自创刊以来就特别深受广大青少年学生喜爱,许多读者来信说:“是《狂飙英语》给了我纯正的发音,给了我适用的语法,也给了我非常自信。” “《狂飙 英语》丰富了我的知识,开阔了我的视野。

进入2006年来,杂志市场销路更是一路看涨,许多学生朋友来信反映无法及时买到贵刊,希望我们能满足他们的愿望。为不负众望,我们破例发行了《狂飙英语》前四期的合订本希望能解广大读者朋友的燃眉之急。

本合订本各地邮局现正零售。

 (1)(填序号)   处, 修改:                                              

  (2)(填序号)   处, 修改:                                            

  (3)(填序号)   处, 修改:                                              

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4、参考词汇:调查: make a survey

Dear editor,

I have recently made a survey among 30 boys and 30 girls in my class about their purpose of getting on the Internet.  ________________________________________________________________________________全品高考网

________________________________________________________________________________ ________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________ ________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________ ________________________________________________________________________________

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图表作文写作训练1

思路点拨

题材:书信;说明+议论   

时态:一般现在时

人称:第三人称

要点提示:(1)上网的目的;(2)读新闻;(3)发送邮件;(4)聊天;(5)学习;(6)玩游戏;(7)评语

范文:

Dear editor,

   I have recently made a survey among 30 boys and 30 girls in my class about their purpose of getting on the Internet.

   The girls’ favorite is chatting, but few boys like it. What the boys like to do most is playing games and the girls also like it. Both boys and girls like to read news or send e-mails on the Internet. Maybe they think it’s the most convenient way to get information from keeping in touch with friends. As for studying, the numbers of boys and girls are equal, but altogether only several of them will use the Internet as a tool to study.

In my opinion, useful as the Internet is, the students had better make better and wise use of it. Otherwise, it’s impossible for us to benefit from it. Moreover, I also hope the parents will pay enough attention to their children using the Internet in their spare time.

                                 Yours

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3、词数:150   

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