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图示是某根弹簧的伸长量x与所受拉力F之间的关系图,则该弹簧的劲度系数为____N/cm.

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同类题2

   One day, a boy found the cocoon(茧) of a butterfly and brought it home. A few days later, the boy saw a small 1in the cocoon. He sat and watched for several hours as a butterfly struggled to make 2body through that little hole. Suddenly it stopped.
   So the boy 3to help the butterfly, thinking the butterfly might be 4. He took a pair of scissors(剪刀) and cut the hole 5. The butterfly came out of the cocoon, but it 6a little different. It had a weak body and small, thin 7. The butterfly didn't start to fly. In fact, the butterfly spent the rest of its life crawling(爬行) around with a weak body and thin wings. It was never able to fly.
   The boy acted with8but he didn't understand why it could be like this. When a butterfly crawl out of the cocoon, it must struggle. The hard work of 9out of the cocoon makes the fluid(液体) from the butterfly's body into its wings. It helps the butterfly be 10to fly. If the butterfly never has to squeeze(挤压) itself out of the cocoon, its wings will never get the fluid and it can never fly.11struggles are what we need in our lives. If we lived our lives without any problems, we would never learn or grow. We would not be 12 we could have been and we would never fly.
   In our lives, pain and suffering is the key to all windows, and sometimes even 13 growth, without it, there's no way of life. We can't avoid 14 or problems. So, next time you are 15 a problem or difficulty, remember the butterfly. Struggle a little–then fly!

同类题4

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                                                                                                    当你不是世界的中心
       ①海水容纳百川,水以天下之至柔驰聘天下之至坚,却从不居功。清风飘送花香,雨水润物无声,这温柔敦厚的自然总是厚德载物,却又不事张扬,更不会以造物主自居。那么自称万物灵长的我们,更应该学会不以自我为中心。
       ②只有当你不把自己当作世界的中心的时候,你才能正确认识自己。所谓“当局者迷,旁观者清”就是这个道理。只有跳出自我,才能认识自我。“天朝上国,物产丰盈,本不必与外夷互通有无”,正是清朝常常以“天朝上国”自居,闭关锁国,没有认识到自身各种弊病,从而日益落后于世界。后人再看历史,无不扼腕叹息。因此跳出自我,并审视自我,才能认识自我,并完善自我。
       ③不以自我为中心,就要有谦和的姿态。北大校长、国学大师季羡林以一位平凡老者的身份替一位入校新生看行李,一看就是几个小时,不恼不怒,反倒用一句“没关系”化解了那名新生的不安。著名影星林志玲在参加一个宣传活动时,很多经销商都和她握手。有人注意到身高 174公分又穿着高跟鞋的林志玲,一定会膝盖微弯,蹲到和对方一样的高度,眼神平视地和对方握手。那天地总共蹲了八十几次。生活中,有些人总是以自我为中心,对每个人都保持一种“高姿态”,这种人其实最无实绩。反而是季羡林和林志玲这样的人,以谦和的姿态平等待人,更显高贵。无论是个人还是民族,都需要学会尊重池人,不以自我为中心,保持自身的风度与姿态。
       ④不以自我为中心,还要学会从他人的角度看世界,而不单从自身出发。或许你以为自己是万众瞩目的大明星,是舞台的焦点,可是,在一个农民眼里,你只是个普通的人,远不及他的庄稼重要。或许你正逼着自己的孩子去上各种各样的补习班,殊不知在他们眼里,蓝天、白云、草地、游戏才能构成最美的童年。所以,在别人眼中你不一定耀眼,你要用他人的眼光看到自己的卑微。在孩子眼中你奉为金科玉律的东西可能一定耀眼,你要用他人的眼光看到自己的卑微。在孩子眼中,你奉为金科玉律的东西可能一文不值,所以你要以孩子的眼光去帮助他们找到幸福与快乐。从他人的角度看世界,你将看到更绚丽的色彩。
       ⑤不以自我为中+心,还要善于向他人学习。“一花一世界-一叶一菩提。“万事万特皆有其闪光的一面。师法自然,小草的坚韧,大树的昂扬,细流的执著,大海的宽容……都会给我们有益的启示:师法大师,圣贤的哲思,大儒的风范,永远是我们追随的目标;师法凡人,芸芸众生里有很多普通人更值得我们学习。 “当代雷锋”郭明义,在平凡的岗位上奉献爱心,几十年如一日;最美女教师张丽莉,不顾个人安危勇救学生……这些平民英雄在日常生活中所展示出口的人性光辉,更是我们学习的榜样,其实我们每个人都是在不断的学习中成长起来的。从某种程度上说,向他人学习是不以自我为中心的更高境界。
       ⑥当你不再是世界的中心,你将明白众生平等,从此不再轻视一只蝴蝶、一片落叶,你将读懂无言的自然和多彩的生活。