国考1号3免费答案2023文数

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17.A【考查点】本题考查电容器充放电问题。【解析】由题图(b)可知，0~1s电容器两端电压U。=0,电容器不带电，电路中无充放电电流，电阻R两端电压为零；1s~2s内，电容器两端电压均匀增大，电容器在充电，充电电流1-9.CA=,所以R两端电压为1，R,2s~3s内，电容器两端电△t△t压不变，电路中没有电流，所以R两端电压为0：3s~5s内，电容器两端电压均匀减小，电容器在放电，放电电流r=4△t'CAUc Io2△t=2,方向与1s~2s时的电流方向相反，此时R两端电压为2，综上分析可知，A正确。

三、参考答案Dear campers,Two weeks has passed since we started the English summer camp in our school and I never thought it wouldfinish so soon.This is a wonderful camp,and everyone,including all the teachers and students,has done his bestto fulfill the tasks.Congratulations on your success and you outstanding teaching and performances will beremembered forever.Please accept my heartfelt thanks,and I hope we will meet again in the nearest future.Here I wish everyone a pleasant journey home,and good luck to you and your family.Thank you very much!