2021-2022英语周报高一新课程第五期答案

14.【答案】(1)每次使用欧姆表和换挡后都要进行欧姆调零(2分)22(1分)(2)D(1分)④(1分)R1(分)(3)步骤d中应该先断开S2,再断开S(2分)【关键能力】本题通过测定自感系数很大的线圈的直流电阻的实验,考查考生的实验探究能力。【解题思路】(1)因为欧姆表每次改换挡位,相当于改变了欧姆表的内部构造,所以毎次使用时都要欧姆调零;因为第一次使用的是×10”挡,指针读数太小,故应该换成“×1”挡,题图a中指针指在“22”,所以电阻约为22g。(2)因为题目要求获得尽可能大的电压调节范围,故采用分压电路,多用电表的直流电流挡的内阻与线圈的直流电阻相比不可忽略,故采用电流表外接法;因线圈的直流电阻约229,可能通过的最大电流为I。=224A≈0.18A=180mA,故应选用250mA挡;为了操作方便用分压电路就要用阻值较小的滑动变阻器,故选用R1(3)断开电路应该考虑线圈的自感先断开开关S1,再断开开关S2,会产生反向感应电压加在电压表两端,可能会使电压表指针迅速反转而受损,故应先断开S2,再断开S

第二节书面表达【写作思路】根据试题要求,考生需要写一篇记叙文,记述身边一位值得尊敬和爱戴的人。首先考生需要介绍自己最尊敬和爱戴的人是谁,简单地介绍一下他(她)。然后,陈述为什么他(她)值得尊敬和爱戴。最后,可以对前文进行一个总结,使文章结构严谨。本文的写作重点在"尊敬和爱戴的原因",考生可围绕这个要点适当拓展,从性格特点、处事风格等方面展开写作。【范文赏读】The most beloved and respected person around me is my teacher, Ms LiThough she has been teaching English for twenty years, she is still passionateabout teaching. She is kind and considerate towards us just like our dear motherWe all respect her because she always tries new ways to make her classes livelyand interesting. Hardworking and knowledgeable, she is one of the best teachersin our school. When we have a problem, we will turn to her for help. She alwaystalks to us patiently and helps us to find a solution. In our eyes, she is not onlyour teacher, but also our best friend. Those are why she deserves our respect【亮点词句】亮点词汇: beloved, respected, be passionate about, be consideratetowards, turn to sb. for help, in one's eyes亮点句式:Why引导的表语从句( why she deserves our respect)

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