题干

小倩用如图所示器材探究影响导体电阻大小的因素,实验板上固定了四根金属丝.A、B、C的长度均为1m,D的长度为0.5m;A、B的横截面积相同,材料不同;B、C的材料相同,但横截面积不同;B、D的材料和横截面积都相同.下列说法中正确的是(   )

A:探究导体电阻大小与横截面积是否有关应选用B和C金属丝接入M、N两点间

B:探究导体电阻大小与导体长度是否有关应选用A和D金属丝接入M、N两点间

C:将B和D金属丝分别连入M、N两点间,连金属丝D时电流表示数大一些

D:该实验装置能探究导体电阻与导体材料是否有关

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答案(点此获取答案解析)

A,C,D

同类题5

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     Some people make you feel comfortable when they are around. You spend an hour with them and feel as if you have known them half your life. ____ .

    Here are several skills that good talkers have. If you follow the skills, they'll help you put people at their ease, and make friends with them quickly.

    First of all, good talkers ask questions. ____ . One well-known businesswoman says, “At business lunches, I always ask people what they did that morning. It's a common question,but it will get things going.” From there you can move on to other matters—sometimes to really personal questions. ____ . Second, once good talkers have asked questions, they listen to the answers .This point seems clear, but it isn't. Your questions should have a point and help to tell what sort of person you are talking to. And to find out, you really have to listen carefully and attentively.

    ____ . If someone sticks to one topic, you can take it as a fact that he's really interested in it. Real listening also means not just listening to words, but to tones of voice. If the voice sounds dull, then, it's time for you to change the subject.

    Finally, good talkers know well how to deal with the occasion of parting. If you're saying goodbye, you may give him a firm handshake and say, “I've really enjoyed meeting you.” ____ . Let people know what you feel, and they may walk away feeling as if they've known you half their life.

A. Real listening at least means some things.

B. You can become a popular person.

C. Almost anyone, no matter how shy he is, will answer a question.

D. And how he answers will let you know how far you can go.

E. If you want to see that person again, don't keep it a secret.

F. It's polite to listen to others with a smile.

G. These people have something in common.