四年级作文 难忘的一节数学课

难忘的一节数学课 秋天的早晨，秋高气爽，阳光明媚。这学期我们新换了一位数学老师，据说是一位很有能力的老师。 早上第一节就是数学课，上课的铃声响了，同学们陆陆续续准备用具，我也不例外。我看了看课 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf ，哇～上午还有我最喜欢的科学课呢～然后我便拿出了昨晚“精心”准备的科学用具??四个电池围着一块磁铁做起实验来。课已经开始了，老师正在讲台上侃侃而谈，但我却依然爱不释手地把它们摆成坦克、飞机„„ 突然，听见老师喊我的名字，我心里一惊，抬起头来，才知道老师叫我回答问 题 快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题 。心慌意乱的我心想:完了，完了，刚才光顾着玩了，没有听到老师讲的什么，怎么回答得出来。我只好慢吞吞地站起来，“嗯„„”地哼着。后果可想而知，老师叫我到门那儿站着。我很不情愿的慢慢走过去，感到全班同学的目光都投射在我的身上，让我尴尬极了，真恨不得找个地缝钻进去～ 我低头在门口站了一会儿，老师便叫我回座位了。一回到座位，我便把电池和磁铁“狠狠”地“摔”进了书包，认认真真地听完了后半节课。后来，我找同学记了前半节课的内容。打那以后，我上数学课再也不敢跑神了，每次上课都认真地听，眼睛盯着老师的一举一动，大脑也跟着老师的思维，每节课上完都有意犹未尽的感觉。 自打那次数学课后，我明白了不论再强的老师，上课不认真听都是学不到知识的。而且，我也知道了一定要尊重别人的劳动成果，认真地学，那样才会进步呀～难忘的数学课 那是上个学期的事情。上课了，老师简单讲了一些杂事情后就叫我们拿出一课三练，她要给我们评讲作业。 评讲到这样一道题时，我和赵老师的 答案 八年级地理上册填图题岩土工程勘察试题省略号的作用及举例应急救援安全知识车间5s试题及答案 不一样。这道题的内容是这样的:一个边长为5cm的小的正方体拼成一个更大的正方体，需要多少个这样的小正方体,赵老师的答案是需要4个这样的小正方体，有很多同学的答案都是需要8个这样的正方体才能拼成大的正方体，我和赵老师的答案一样。有很多同学和赵老师辩论，可赵老师就是赵老师，他们都没有把老师说服。 我看到同学们三分之二的都填的是8个小正方体，我就想:“万一填8才是正确的呢,”我来算一算，再画个图验算一下吧。结果我的图形表明了8个小正方体才能拼成一个大而最小的正方体，我发现老师的答案真是错误的。我想立即给老师说，可又想起才学过的一篇课文—《酿》。《酿》这篇课文中学生给老师指出错误，老师觉得没面子，学生又是那么的难过，我这样给老师指出来，老师生气了，我那我该怎么办呢,还是算了吧，多一事不如少一事。可我又不甘心让全班同学掌握一个错误的知识，还是给老师说吧。我temperature piping and equipment, avoid oil pipeline, avoiding vibration equipment, principles of construction of beautiful and neat easy to install. 5.1.5.2 from field instrumentation and valves field junction boxes to the single line slot cable using pipe, 220VAC power cord shall be full pipe laying, indoor coaxial cables concealed and outdoor wear buried. 5.1.5.3 bending cold bending method should be used to protect pipe, bending angle should not be less than 900, when wearing non-armoured cable and laid, bend radius should not be less than 6 times the pipe diameter, when while wearing armored cable and concealed, bend radius should not be less than 10 times the pipe diameter. Bend protection tube there should be no dents, cracks, single right-angled bend protection tube should not be more than two. 5.1.5.4 between protective tube and between protective tube and connector, threaded connections should be used, it tube end screw thread length should not be less than 1/2 of the fitting, and ensures the electrical connection. 5.1.5.5 protection tube should line up, ... 5.1.7 5.1.7.1 check tubing for pressure piping laying pipe, components, materials and specifications meet the design requirements, and have quality certificates, before laying should be cleared by welding and bending the welding slag, rust, chip or a foreign body, and preservative treatments. 5.1.7.2 in pressure piping welding welder must have a valid welder certificate. 5.1.7.3 tubing under the conditions to meet measurement requirements should be as short as possible, General length should not be more than 15m, pipe bending cold bending, cutting machine, minimizing bending and cross, and there shall be no sharp and complex bending, bending radius of not less than 3 times the pipe diameter. 5.1.7.4 pipe and process equipment, piping, or building surface distance is greater than 50mm, not be laid parallel to the oil, combustible, explosive 鼓起勇气举手说出了自己的观点，老师开始还不相信，和我展开了非常激烈的争辩，我还 把我画的图拿给老师看，老师终于同意了我的观点，向全班公布了真正正确的答案。老师 表扬了我，还要我以后在赵老师有错的时候要及时提出来。我当时可高兴了，激动的心情 简直没法形容。 我的这种行为得到了老师的肯定，我真是高兴极了，我也为我有这样的老师而自豪。 这堂课已经过去了好久了，直到现在只要一上数学课，我就会想起赵老师表扬我的情景。 temperature piping and equipment, avoid oil pipeline, avoiding vibration equipment, principles of construction of beautiful and neat easy to install. 5.1.5.2 from field instrumentation and valves field junction boxes to the single line slot cable using pipe, 220VAC power cord shall be full pipe laying, indoor coaxial cables concealed and outdoor wear buried. 5.1.5.3 bending cold bending method should be used to protect pipe, bending angle should not be less than 900, when wearing non-armoured cable and laid, bend radius should not be less than 6 times the pipe diameter, when while wearing armored cable and concealed, bend radius should not be less than 10 times the pipe diameter. Bend protection tube there should be no dents, cracks, single right-angled bend protection tube should not be more than two. 5.1.5.4 between protective tube and between protective tube and connector, threaded connections should be used, it tube end screw thread length should not be less than 1/2 of the fitting, and ensures the electrical connection. 5.1.5.5 protection tube should line up, ... 5.1.7 5.1.7.1 check tubing for pressure piping laying pipe, components, materials and specifications meet the design requirements, and have quality certificates, before laying should be cleared by welding and bending the welding slag, rust, chip or a foreign body, and preservative treatments. 5.1.7.2 in pressure piping welding welder must have a valid welder certificate. 5.1.7.3 tubing under the conditions to meet measurement requirements should be as short as possible, General length should not be more than 15m, pipe bending cold bending, cutting machine, minimizing bending and cross, and there shall be no sharp and complex bending, bending radius of not less than 3 times the pipe diameter. 5.1.7.4 pipe and process equipment, piping, or building surface distance is greater than 50mm, not be laid parallel to the oil, combustible, explosive 难忘的一节数学课 “喂，赵彦惠，你知道今天赵老师又要教什么吗,”同桌赵阳问道。我毫不在意的说:“不就是学‘多边形面积的计算吗’～”赵老师让我们带剪刀和图形就是让我们 ......拼拼剪剪的。我们班的刘文奇也加入了我们讨论的行列，老师可能让我们”一声优美的音乐打断了我们的讨论。赵老师在音乐快结束时踏进了教室。 „„ “同学们，你们一定学过正方形，长方形我们今天就学习平行四边形的面积，你们能否把平行四边形转化为一个我们学过的图形呢,”我迫不及待的拿出了剪刀和图片，左看看，右瞧瞧，不知从哪儿下手才好。我仔细观察了一阵，终于发现了～只要沿着平行四边形的高剪下一个直角三角形，在移到另一边，就拼成了一个长方形，而且，我惊奇的发现平行四边形的面积和长方形的面积是相等的，长方形的长就是平行四边形的底，它的宽就是平行四边形的高。因为长方形的面积等与长乘宽，所以平行四边形的面积是底乘高。我得意地转到刘文奇的面前说:“你发现了吗,我知道平行四边形的面积怎么计算了。”“我早知道了，不是还有第二种 方法 快递客服问题件处理详细方法山木方法pdf计算方法pdf华与华方法下载八字理论方法下载 吗,”“什么,”我惊讶道。“你看，沿着平行四边形的一条高还能剪下一个梯形，再把它移到另一边，不也是一个长方形吗,”我恍然大悟，佩服的说:“你真不愧是我们班的‘数学课代 „„表’啊～ 这节课我通过剪、移、拼，知道了平行四边形面积的计算方法，更领悟:数学世界是奇妙的，有很多值得我们探索和发现的知识～只要我们善于动脑，勤于动手，就能发现数学中更多的奥秘，这真是一节难忘的数学课～ temperature piping and equipment, avoid oil pipeline, avoiding vibration equipment, principles of construction of beautiful and neat easy to install. 5.1.5.2 from field instrumentation and valves field junction boxes to the single line slot cable using pipe, 220VAC power cord shall be full pipe laying, indoor coaxial cables concealed and outdoor wear buried. 5.1.5.3 bending cold bending method should be used to protect pipe, bending angle should not be less than 900, when wearing non-armoured cable and laid, bend radius should not be less than 6 times the pipe diameter, when while wearing armored cable and concealed, bend radius should not be less than 10 times the pipe diameter. Bend protection tube there should be no dents, cracks, single right-angled bend protection tube should not be more than two. 5.1.5.4 between protective tube and between protective tube and connector, threaded connections should be used, it tube end screw thread length should not be less than 1/2 of the fitting, and ensures the electrical connection. 5.1.5.5 protection tube should line up, ... 5.1.7 5.1.7.1 check tubing for pressure piping laying pipe, components, materials and specifications meet the design requirements, and have quality certificates, before laying should be cleared by welding and bending the welding slag, rust, chip or a foreign body, and preservative treatments. 5.1.7.2 in pressure piping welding welder must have a valid welder certificate. 5.1.7.3 tubing under the conditions to meet measurement requirements should be as short as possible, General length should not be more than 15m, pipe bending cold bending, cutting machine, minimizing bending and cross, and there shall be no sharp and complex bending, bending radius of not less than 3 times the pipe diameter. 5.1.7.4 pipe and process equipment, piping, or building surface distance is greater than 50mm, not be laid parallel to the oil, combustible, explosive 难忘的一节数学课 从小学一年级到现在，我上过无数堂各种各样的教课，但是我印象最深的，还是这学期赵老师讲的一次数学课。 “叮铃铃，叮铃铃，”上课铃声响了。像往常一样，同学们飞快跑进了教室，安静地等待着数学老师，“这节数学课，数学老师又会耍什么新花样呢,”我猜想着。正在这时，赵老师踏着最后一声铃声，面带微笑的走进了教室。 赵老师走到讲台上，笑着对我们说:“同学们今天老师教你们玩一个数学游戏，叫24点。”接着拿出了一副扑克牌。 一听赵老师说要玩游戏，我们班的调皮鬼来了兴趣，站起来说:“什么叫24点啊,” “24点吗～就是先从扑克牌中取出4张牌，取出来的数，随你用什么运算符号，只要把他算成24就行了，不过要注意，每个数字只能用一次～”赵老师解说道。 “哦～原来如此～”大家听了，都很兴奋的等待老师开始游戏。 “在开始游戏之前，请大家先想一下，我们这堂课要用到以前所学到的哪些知识,”赵老师微笑这对我们说，接着赵老师从混合过的扑克牌中取出4张牌。接着对我们说:“这次是这四张牌:5.8.10.5”。 不一会儿，我们班的张锐同学顿时举起了手，得意洋洋的说:“十加五乘八除以五等于24” 赵老师笑着说:“不错，继续努力～” “我可不能落后”我自言自语。 “请同学们注意～”说着，赵老师又从扑克中取出4张扑克牌，这次是6.2.8.4，这下，我的脑子快速运转起来八除四加二乘六，可是如果算错了，在同学们面前多丢人啊～于是，我又验算了一遍，全对，不过，答案又被别人抢走了，老师又从扑克牌中取出了4张牌，分别是:3.3.8.3，不一会儿我就说出了答案。举起手说(三减三加三)乘以八等于24，老师听了我的答案，高兴说:“对没错～”老师夸奖道。 “零.......”忽然，下课铃响了，同学们还是意犹未尽，“哎～真扫兴，这节课真短～” “同学们，我们这节课通过24点的游戏练习了加减乘除运算的灵活运用，希望以后的学习中，也像今天这样。快快乐乐认认真真的学习。”伴随着下课铃声，赵老师结束了这次数学课。 temperature piping and equipment, avoid oil pipeline, avoiding vibration equipment, principles of construction of beautiful and neat easy to install. 5.1.5.2 from field instrumentation and valves field junction boxes to the single line slot cable using pipe, 220VAC power cord shall be full pipe laying, indoor coaxial cables concealed and outdoor wear buried. 5.1.5.3 bending cold bending method should be used to protect pipe, bending angle should not be less than 900, when wearing non-armoured cable and laid, bend radius should not be less than 6 times the pipe diameter, when while wearing armored cable and concealed, bend radius should not be less than 10 times the pipe diameter. Bend protection tube there should be no dents, cracks, single right-angled bend protection tube should not be more than two. 5.1.5.4 between protective tube and between protective tube and connector, threaded connections should be used, it tube end screw thread length should not be less than 1/2 of the fitting, and ensures the electrical connection. 5.1.5.5 protection tube should line up, ... 5.1.7 5.1.7.1 check tubing for pressure piping laying pipe, components, materials and specifications meet the design requirements, and have quality certificates, before laying should be cleared by welding and bending the welding slag, rust, chip or a foreign body, and preservative treatments. 5.1.7.2 in pressure piping welding welder must have a valid welder certificate. 5.1.7.3 tubing under the conditions to meet measurement requirements should be as short as possible, General length should not be more than 15m, pipe bending cold bending, cutting machine, minimizing bending and cross, and there shall be no sharp and complex bending, bending radius of not less than 3 times the pipe diameter. 5.1.7.4 pipe and process equipment, piping, or building surface distance is greater than 50mm, not be laid parallel to the oil, combustible, explosive 难忘的数学课 前些天，听班主任说请了几天病假的数学老师——赵老师，要为我们上课，同学们的心顿时担心起来。 课前，同学们不约而同地做好了课前准备，安静得像一根针掉下来都能听的清清楚楚。连“小捣蛋鬼”也这么安静地等待老师，我看此情形，心里很高兴。 忽然，一个高大的身影从窗前移过。哦，原来是数学老师来了。他走到讲台前，轻声一说:“上课。”“起立。”同学们“刷”地一声，站了起来，精神奕奕地说:“老师您好～”“坐下。”同学们又“刷”地一声坐下了。老师说:“今天，我讲的内容是关于简易方程的。”说完，老师就在黑板上写了几道题，并讲解这些题的做法。我看到老师那疲劳的样子，心想:老师的病一定不轻，我很应该自觉遵守纪律，让老师更好地上课。老师的声音很小，好像一不留神就会被一句话溜掉。老师让我们做题时，时常挨着讲台，慢慢坐下，然后就闭目养神。他为我们出题时，他的手挨着黑板，十分辛苦地写起字来。虽然周围的同学很认真地听老师讲课，但看到老师这样辛苦，心里的确很难受。回想起以前的赵老师是十分精神的，腰挺得很直，说话的声音清楚响亮，真希望他能早日康 复。 老师我想对你说:“啊，老师。您像园丁，辛勤地培育着祖国的花朵;您又像蜡烛，照亮了我们的一切;您还像火堆，把您那暖烘烘的温暖，流入了我们的心田。老师啊～您是多么的伟大那～我一定会好好学习，以优异的成绩报答您。” 这节数学课让我永生难忘。 temperature piping and equipment, avoid oil pipeline, avoiding vibration equipment, principles of construction of beautiful and neat easy to install. 5.1.5.2 from field instrumentation and valves field junction boxes to the single line slot cable using pipe, 220VAC power cord shall be full pipe laying, indoor coaxial cables concealed and outdoor wear buried. 5.1.5.3 bending cold bending method should be used to protect pipe, bending angle should not be less than 900, when wearing non-armoured cable and laid, bend radius should not be less than 6 times the pipe diameter, when while wearing armored cable and concealed, bend radius should not be less than 10 times the pipe diameter. Bend protection tube there should be no dents, cracks, single right-angled bend protection tube should not be more than two. 5.1.5.4 between protective tube and between protective tube and connector, threaded connections should be used, it tube end screw thread length should not be less than 1/2 of the fitting, and ensures the electrical connection. 5.1.5.5 protection tube should line up, ... 5.1.7 5.1.7.1 check tubing for pressure piping laying pipe, components, materials and specifications meet the design requirements, and have quality certificates, before laying should be cleared by welding and bending the welding slag, rust, chip or a foreign body, and preservative treatments. 5.1.7.2 in pressure piping welding welder must have a valid welder certificate. 5.1.7.3 tubing under the conditions to meet measurement requirements should be as short as possible, General length should not be more than 15m, pipe bending cold bending, cutting machine, minimizing bending and cross, and there shall be no sharp and complex bending, bending radius of not less than 3 times the pipe diameter. 5.1.7.4 pipe and process equipment, piping, or building surface distance is greater than 50mm, not be laid parallel to the oil, combustible, explosive