题干

我国古代有这样一道数学问题:“枯木一根直立地上,高二丈,周三尺,有葛藤自根缠绕而上,五周而达其顶,问葛藤之长几何?”题意是:如图所示,把枯木看作一个圆柱体,因一丈是十尺,则该圆柱的高为20尺,底面周长为3尺,有葛藤自点A处缠绕而上,绕五周后其末端恰好到达点B处,则问题中葛藤的最短长度是____尺.

上一题 下一题 0.0难度 选择题 更新时间:2012-07-26 06:24:59

答案(点此获取答案解析)

25

同类题2

完形填空

    They say after a parents dies, the surviving children can taken on some of their parent's characteristics. I 1becoming anything like my dad for years 2I wanted to be me, not him; but there I sat at his memorial service several months ago, telling myself, “ You've 3a lot more of your dad in you than you think.”

    There is this phrase my dad 4, and I know I'm going to sound 5to complain about it, but it used to 6me. “ I am so proud of you,” he told us kids, whether we'd won a race or helped others. That should be a (n) 7thing, but here's what always 8 my mind: “ You are taking credit for what isn't really yours. You can be proud, but the 9 is mine.

    Your parent is doing his best to give you 10, but you do not 11it. “ I'm so proud of you.” It came out of my dad's mouth 12, on those calls where I might have 13  something that happened at work or when he and Mom came to visit and we 14the talents of our two boys. I knew the feeling of parental 15well, especially when my boys achieved in ways that were  16my comprehension and ability, but I looked for other ways to 17 it. “ That's an extremely good story you've written!” I would say about the composition. I thought that by making my praise 18, it would feel like I was claiming their achievement less as mine and more as one they could own themselves.

    So just the other day when my older son sent me an email about his scholarship, I searched  for 19things to say, but finally20he doesn't need my cleverness. They just want what my dad gave me. “ I'm so proud of you,” I wrote. Just like the old man to me.

同类题5

阅读下列材料,回答问题学
材料一  1856年,亚历山大二世向莫斯科贵族发表演说,他说:“到处在谣传,我要给农民自由,这是不公正的,……但是,遗憾的是,农民和他们的地主之间存在着敌对情绪,并因此发生了许多不服地主管束的事情。……因而,从上面解决要比从下面解决好得多。”
——摘自孙成木《俄国通史简编》
材料二  “请你们相信,为了保护地主的利益,凡是能做到的一切都做到了”
——亚历山大二世,1861年俄历2月
材料三  1868年4月的一天,日本京都皇宫的大殿内,天皇率领群臣宣读誓词:“广兴会议,万机决于公论;上下一心,大展经论;官武一体以至庶民,各遂其志,务必人心不倦;破历来之陋习,基于天地之公道;求知识于世界,大力振兴皇基。”这就是日本历史上著名的“五条誓文”。                                       ——摘自人教版历史选修1
请回答:
(1)材料一和材料三分别涉及了俄、日历史上哪次重大改革?两国的改革在性质上有什么相同之处?
(2)根据材料二并结合所学知识,指出亚历山大二世采取了什么措施来 “保护地主的利益”? 从中,我们可以看出俄皇的这次改革其实质是什么?
(3)日本政府在这次改革中采取什么措施“求知识于世界”?这次改革对日本有何重要影响?
(4)日本在经历了这次改革后的崛起带给我们什么启示?