问题 填空题

小明在用一根弹簧制作弹簧测力计的实验时,在弹簧的下端挂不同重力的钩码,并用刻度尺测出每一次弹簧的长度,具体数据见下表:

钩码重力G/N024681012
弹簧长度l/cm3456788.5
(1)该弹簧测力计的量程是______N;弹簧的原长是______cm.

(2)分析表中这些实验数据,可以得到的实验结论是:______.

答案

(1)从表格中可以看出,钩码的重力每增加2N,弹簧伸长1cm,而当拉力从10N增加到12N时,弹簧却只伸长了0.5cm,说明此时超过了弹簧的弹性限度,因此,该弹簧测力计的量程是0~10N.钩码重为0N时,弹簧的长度为3cm,这就是弹簧的原长;

(2)分析数据可知,在拉力没有超过10N时,拉力每增加2N,弹簧伸长1cm,因此可以得出:在弹性限度内,弹簧的伸长与拉力成正比;

故答案为:(1)0~10;3;(2)在弹性限度内,弹簧的伸长与它受到的拉力大小成正比.

阅读理解

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。

I can’t count the times I called my sister and said, “____2____” She would gasp and stammer(结结巴巴): “I can’t. I have clothes on the line. My hair is dirty. I wish I had known yesterday. I had a late breakfast. It looks like rain.” And my personal favorite response: “It’s just Monday.” She died a few years ago. We never did have lunch together. From then on, I’ve tried to be a little more flexible.

___3__The days get shorter, and the list of promise made to ourselves gets longer. One morning, we are awoken, and all having to show for our lives is repetition of “ I’m going to”, “ I plan on” and “someday, when things are settled down a bit.”

When anyone calls my “seize the moment” friend, she is open to adventure and available for trip. She keeps an open mind on new ideas. Her enthusiasm for life is contagious.___4___My lips have not touched ice cream for 10 years. I love ice cream. The other day, I stopped the car and bought a triple-decker. If my car had hit an iceberg on the way home, I would have died happy.

___5___Do something you want to….., not something on your SHOULD DO LIST.

A.Now go on and have a nice day.

B.Just possible, she may be the wisest woman on this planet.

C.Life has a way of going faster as we get older.

D.So I won’t feel sorry because I have changed my attitude to life.E. How about going to lunch in half an hour?

F. She used to promise to do something instead of doing it right away.

G. You talk with her for a while and you’re ready to change your attitude to life.

单项选择题