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_爱下问搜题

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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

下列有关温带大陆性气候特点的描述中，正确的是[ ]

A．冬季寒冷漫长，夏季温暖短暂

B．全年严寒

C．冬季寒冷多雨，夏季炎热干燥

D．四季分明

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.

B．heartbroken

C．bad-tempered