问题 填空题

某一定值电阻两端的电压与电流关系的图像如图所示,该定值电阻的阻值为_____Ω,当该电阻两端电压为0V时,此时该电阻的阻值为______Ω.

答案

10  10

题目分析:由图像可见,当电阻两端电压为6V(或2V等)时,通过电阻的电流为0.6 A(或0.2A等),根据欧姆定律可得填写“10”,电阻是导体固有的属性,只与导体的材料、长度、横截面积等有关,与导体两端电压大小及有无没有关系,当该电阻两端电压为0V时,该电阻的阻值仍为10Ω.

选择题
完形填空
I used to be a very self-centered person, but in the past two years I have really changed. I have started to think about other people        I think about myself. I am happy that I am becoming a       person.
I think my        started when I was at Palomar College. At first, I just wanted to get my       and be left alone. I thought I was smarter than everyone else, so I hardly ever         to anyone in my classes. By the end of my first semester, I was really        . It seemed as if everyone but me had made friends and was having fun. So tried a (n)        . I started asking people around me how they were doing, and if they were having trouble I       to help. That was really a big        for me. By the end of the year, I had several new friends, and two of        are still my best friends today. 
A bigger cause of my new        , however, came when I took a part-time job at a Vista Nursing Home. One old lady there who had Alzheimer’s disease became my         . Every time I came into her room, she was so       because she thought I was her daughter. Her real daughter never        her, so I took her place. She let me       that making others feel good make me feel good, too, when she died, I was       , but I was very grateful to her.
I think I am a much        person today than I used to be, and I hope I will not        these experiences. They have         me to care about other people more than about myself. I        who I am today, and I could not say that a few years ago.
小题1:
A.since B.before C.or D.unless
小题2:
A.famousB.simpleC.different D.skilled
小题3:
A.education B.careerC.tourD.change
小题4:
A.balanceB.homeworkC.degreeD.interest
小题5:
A.talkedB.wrote C.lied D.reported
小题6:
A.carefulB.lonelyC.curiousD.guilty
小题7:
A.argument B.game C.experimentD.defense
小题8:
A.dared B.offeredC.hesitated D.happened
小题9:
A.dream B.problemC.dutyD.step
小题10:
A.usB.which C.them D.whom
小题11:
A.attitude B.hobbyC.hope D.luck
小题12:
A.friendB.partnerC.guide D.guest
小题13:
A.politeB.happy C.strangeD.confident
小题14:
A.bothered B.answered C.visitedD.trusted
小题15:
A.explainB.guessC.declareD.see
小题16:
A.homelessB.heartbrokenC.bad-tempered D.hopeless
小题17:
A.quieterB.busier C.better D.richer
小题18:
A.forget B.faceC.improveD.analyze
小题19:
A.forcedB.preferredC.orderedD.taught
小题20:
A.missB.like C.wonder D.expect