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问题 选择题

一段电阻丝正常工作时的电功率为20瓦，若将这段电阻丝均匀拉长一些后再接到原来的电源上，则它的实际功率（　　）

A．大于20瓦

B．等于20瓦

C．小于20瓦

D．无法判断

答案

将电阻丝拉长的同时横截面积变小，所以阻值变大，

由公式P=

U2
R
知：电源电压一定，电阻变大，实际功率减小．

故选C．

改错题

短文改错

       英语课上，老师要求同桌同学相互修改作文。假设以下短文为你同桌所写，请你对其进行修改。文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号，并在此符号下面写出该加的词。

删除：把多余的词用斜线＼划掉。

修改：在错词下面划一横线,并在该词下面写出修改后的词。

注意：1、每处错误及其修改均仅限一词；

            2、只允许修改10处,多者从第11处不计分。

     It was a long time since we last saw each other. You can hardly imagine how I miss you. How are

you getting with your first job? I remember you once tell me you were eager to graduate and become an

English teacher. Now you must have many first-hand experience. How do you find your English teaching?

Is teaching kids English as interested as you expected in college? And do your student enjoy your

classroom teaching? Anyway, I believe you must very popular with the kids, for you are a born teacher.

Hope you great success in your work! Yes, why not give me call and come for a get-together in this

weekend?

                                                                                                                                                          

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单项选择题

依法确认应该赔偿的，赔偿义务机关和复议机关逾期未作出决定的，赔偿委员会应当（）。

A.予以维持

B.撤销原决定，依法作出决定

C.作出变更决定

D.作出予以赔偿的决定
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