2022九年级英语外研版英语周报35期答案

读后续写Af:er reading the diary, the son was filled wich tears and began to reflect on the days when he used to sirtogether with his father. His lather would patiently answer the same question all 23 times without feelingirritation while his father asked hint the same question just four times! The son thought to himself, If I attainold age, how will my son look at me? Will he think of me as a burden? Will he shout at me because of my poorsight, poor hearing or poor understanding?Feeling ashamed, the son got down on his knees before his father. He made an apology to his fathergging his father to forgive him for his bad behavior. He sz.id this aloud,"I promise to see you happy foreverDad. It is you who have cared ior me since I was a little child, showering your selfless affection on me. Youworked hard to make money so that I could afford to go to university. I will serve you in the best day.

23.(1)×100(1分)欧姆调零(1分)1200(2分(2)黑箱内的电路结构图如图所示(2分))6(2分)1(2分)【解析】(1)多用电表指针的偏转角度过小说明指针靠近无穷处,所以要换更高的挡位,因此需选择“×100”倍率的电阻挡,同时注意欧姆调零,多用电表的测量结果为12×1000=1200g。(2)A、B间电阻与电流方向无关,因此一定是定值电阻,A、C间电阻与电流方向有关,电流从C到A时电阻远小于反向电阻,说明二极管一定直接接在A、C间,且C为正极,黑箱内的电路结构图如图所示。(3)①由图丙所示电路图可知电源的电动势E=U+1R,由题意可知E=3+R×3×10.E=.5+R×12×103,联立解得E=4.5VRv=6kΩ。②若电压表的示数为1V,电路中的电流为I==R,其中Rn=R+R,代入数据解得R=lkQ。

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