大量事实表明：弹力的大小跟形变的大小有关。某同学为了探究“弹_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题填空题

大量事实表明：弹力的大小跟形变的大小有关。某同学为了探究“弹簧的弹力F和弹簧伸长量x的关系”对某一弹簧进行了测试，根据测得的数据绘出了如图所示的图线。这根弹簧在正常使用时的劲度系数为 N/m。

答案

150N/m

题目分析：图线末端发生了弯曲的原因是超出了弹性限度，注意该图象中横坐标为伸长量，纵坐标为拉力，根据胡克定律得斜率为劲度系数，由此可求出．

点评：比较简单，是一道考查基础知识的好题．根据胡克定律结合数学知识即可正确解答．

单项选择题

毒蛇咬伤，局部伤口红肿严重，有水疱、血疱、瘀斑，严重者出现局部组织坏死，恶寒发热，烦躁，咽干口渴，胸闷心悸，舌质红，苔黄，脉数。内治方剂宜选用（）

A.清营汤

B.黄连解毒汤

C.龙胆泄肝汤

D.活血驱风解毒汤

E.普济消毒饮

完形填空

Dear Seth,
You’re only three years old, and at this point in your life you can't read, much less understand what I’m going to try to tell you in this letter. But I've been thinking a lot about the life that you have ____ you, about my life so far as I ____ on what I've learned, and about my role as a dad in trying to prepare you for the ____ that you will face in the coming years.
Be thankful. You are at a wonderful ____ of life. You have still many wonderful stages of life, but they are not without their costs and ____. I hope to help you along your path by sharing some of the best of ____ I've learned. As with any advice, take it with a grain of ____. What works for me ____ not work for you.
Life can be cruel. There will be people in your life ____ won't be very nice. They'll laugh at you because you're different, or for no good ____. They might try to bully you ____ hurt you.
There's not much you can do about these people except ____ to deal with them, and learn to choose friends who are kind to you, who ____ care about you, who make you feel good about yourself. When you find friends like this, ____ them, treasure them, spend time with them, be kind to them and love them.
There will be _____ when you meet with disappointment instead of success. Life won’t always ____ the way you want. This is just another thing you’ll have to learn to deal with. But instead of letting these things get you down, push on, _____ disappointment and learn to persevere and to pursue your dreams _____ pitfalls. Learn to turn negatives into positives, and you’ll do much better in _____. You will also face heartbreak and abandonment by those you love. I hope you don’t have to face this too much, but it happens. Again there is not much you can do but to heal, and to move on with your life. Let these pains become stepping stones to better things in life, and learn to use them to make you _____.

A．regardless of

C．at the back of

D．in the front of

C．difficulties

A．consequence