题干

下列有关电磁现象的说法中,正确的是(  )

A:直流电动机工作时,线圈刚转至平衡位置,换向器就自动改变线圈中的电流方向

B:磁场对放入其中的物体有力的作用

C:奥斯特实验说明导体周围存在磁场

D:发电机是根据电磁感应现象制成的

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答案(点此获取答案解析)

D

同类题2

        Some people think only school children do not agree with their parents, however, it is not true.   1  is a problem for parents and children of all ages. If it's hard for you to communicate with your   2 , don't worry about it. Here is some advice for you to bridge the generation gap (代沟).
        Don't argue with your parents. Don't get to your parents when you are   3 . Your parents probably won't   4your ideas if you are shouting at them. And you can't express yourself  5  if you are angry. Go someplace to cool off. Make sure you understand why you are unhappy. Then think about what you want to   6 to your parents. If you don't think you can speak to them at the moment,  7  writing a letter.
        Try to reach an agreement. Sometimes you and your parents  8  on something. You can keep your disagreement and try your best to   9 each other. Michael's mother didn't agree with him about buying a motorcycle. They  10  over it. But they finally came to an agreement. Michael bought the motorcycle, but only   11it on certain days.
      Of course, your parents might refuse to agree on something. In these  12 , it is especially   13to show love and respect to them. Showing respect will keep your relationship with your parents strong.
         Talk about your  14 . The values of your parents are probably different from those of your own. Tell your parents what you 15  about, and why. Understanding your values might help them see your purposes in life.
      A good relationship with your parents can make you a better and happier person. It is worth having a try!