题干

如图所示,若开关S闭合后,灯L1L2均不亮,小华同学利用一根导线去查找电路故障,当她将导线连接在灯L1两端时,两灯均不亮,将导线连接在灯L2两端时,灯L1亮而灯L2不亮.由此可以判断( )

A:灯L1短路

B:灯L2短路

C:灯L1断路

D:灯L2断路

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答案(点此获取答案解析)

D

同类题3

阅读下面短文,根据短文内容,完成下面各题。

    A life coach is somebody who helps you reach all kinds of personal and professional goals(目标). Each of us has the ability to be our own life coach. Here is some advice about how to be your own life coach:

    Pay attention to your relationships with others. Ask yourself the following questions: How do you deal with disagreements? When was the last time you showed your family members that you care for them? Your relationships with friends, family members and teachers show a lot about the kind of person you are.

    Face the fears about the future. Now, imagine that one of your good friends told you that he or she was not strong enough to go back to school. We often give better advice than we are willing to take ourselves. Remember that even the most successful people were probably told that what they wanted to do was impossible. ①但是他们坚持努力工作,永不放弃。

    Develop your talents. ②If you want to achieve your goals, you will have to spend more time developing the talents you already have. And you should also uncover (发现)any hidden talents that you haven't discovered yet. So you can take classes in subjects that you are interested in, even if you have no experience.

    Be thankful. Take some time to be thankful for the things you do have. Remember positive (积极的) things. Think of the best days you have had in the past month or year. Remember special parties, vacations and holidays. Thank for the wonderful people you have in your life.