题干

为了消除人体上因摩擦而产生的静电,在加油站里加油时,一般都要先用手触摸释放静电按钮、将静电释放掉后再加油,如图所示.则下列说法中,正确的是(  )

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A:只有固体之间的相互摩擦才能产生静电

B:摩擦起电的实质是:相互摩擦的物体间产生了电子的得失

C:静电释放按钮上面手触摸的部位是绝缘体

D:静电释放时电子运动的方向就是电流方向

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答案(点此获取答案解析)

B

同类题5

阅读下面短文,掌握其大意,然后从各题所给的四个选项中选出一个最佳答案。

    One night in November, Itzhak Perlman gave a concert in a theatre. If you have ever been to a Perlman concert, you know that becoming a violinist is not a small 1 for him. He had to walk 2 the help of two walking sticks as a result of the disease he caught as a child.

    People sat 3 while he made his way to his chair and began his play. But this time, something went 4. Just as he finished the first few parts of the music, one of the wrings(弦) on his violin 5. We thought that he would have to stop the concert. But he didn't. 6, he waited a moment, closed his eyes and then 7 the conductor(指挥) to begin again. The orchestra(管弦乐队) began and he played with such strong feeling and purity as they had 8 heard before.

    Of course, everyone knows that it is 9 for a violinist to play a pleasant work with just three strings. I know that, and you know that, 10 that night Itzhak Perlman didn't want to accept that.

    When he finished, there was a terrible 11 in the room. And then people rose and 12 from every corner of the theatre.

    Perlman was excited. He smiled and said, "You know, sometimes it is the artist's task to 13 how much music you can still make with what you have left."

    So, suppose our task in this fast-changing world is to make 14, at first we should try out best with all that we have. And then,    15 it is no longer possible, try to play it with what we have left.