植树问题教学研究

形植树问题是小学数学教学的疑点,也是教学的难点.教学这部分内容,要尽量让学生动手操作,在实践中认识该类问题与其他问题的不同之处,建立正确的解题思路.可以通过研究简单的条形植树问题,找出该类问题的解题方法,为解决复杂的条形植树问题夯实基础.要利用比较手段帮助学生建立起正确的概念,为判定问题的归属打下基础.     

植树(口头通知)(英文)

Boys and girls,Attention,please! March 12 is our Tree-planting Day.All the students in our school are asked to take part in the activity. Each class must take five or six basins with you to water young trees. We are going to gather at the school gate     

植树

三月是植树的好时节。这一天,天气晴朗,和煦的春风轻轻地吹拂着大地。我们在老师的带领下来到山坡植树。     

植树

北京取得了2008年奥运会的主办权,并把“绿色奥运”作为主题之一。老师说这不只是一个口号,更是一种责任。     

我到沙漠去植树

无边的沙漠上黄沙漫天飞舞,太阳火辣辣地照着大地,土地都裂开了。这天,我开着我发明的植树机到干旱的沙漠去植树。我的植树机满载着树苗。我按下红色按钮,植树机就伸出长长的铲子把干裂的黄土铲掉,如果石头硬的话,     

Planting Trees

Shouhl students make friends on line？ Some people say yes. Internet helps people make many friends. Chatting on line, students can express more freely, and even get help for their foreign lan- guage studies. Others, however, someone thinks students should not. They say making friends on line is a waste of time. It＇s not good for study. Besides. Even some students get cheated on line. It is my opinion that students should place their study, health and safety before other things. As for friendship, we can find it in our classmates and other people around us.     

Planting Trees

Today is March 12th.It is Planting Tree Day1.There were no classes this morning.The all2teachers and students went to plant trees along the road in front of our school.We went there by bike.As soon as we got there,we began working.First,Mr.Wang,our head teacher asked us to dig holes.The holes must be enough large3for the trees.After a short time,a truck came.There were many young trees on it.Some students put the young trees in the holes.Other students watered the young trees.What4hard we worked!     

Planting Trees

<正>Today is March 12th.It is Planting Tree Day1.There were no classes this morning.The all2teachers and students went to plant trees along the road in front of our school.We went there by bike.As soon as we got there,we began working.First,Mr.Wang,our head teacher asked us to dig holes.The holes must be enough large3for the trees.After a short time,a truck came.There were many young trees on it.Some students put the young trees in the holes.Other students watered the young trees.What4hard we worked!     

树木,树新机

Today,I fear for the future of our forests and the people in my country.I worry about people like my mother,Florence,a 1)peasant farmer who is no longer sure about when to plant her corn because of the changing seasons and land.     

混沌在植树造林中的应用

把混沌理论应用到植树造林当中,认识到植树造林是营造一个生物群,生物群是一个非线性的混沌系统,构建生物复合空间,简化物种之间的关系,得出规律用于对植树造林的再认识,改进植树造林管理理念,优化植树造林的方法。     

茂名市绿化环境效应的研究

根据测定结果,茂名市绿化环境效应有:小气候效应——降温0.3～1.3℃,增加相对湿度 3～19％,遮荫10304.9～31758.81ux;负离子效应——绿地中负离子浓度是 0.60×10~2～5.15×10~2个/cm~3;消声效应——净消减噪音量为0.3～6.3dB(A)。为了提高绿化环境效应,绿化覆盖率须达35％以上,应是多层次乔灌草结合、阔叶针叶搭配的复合绿化结构。     

林逋孤山植梅事迹辨

林逋隐居孤山,以咏梅著称于世,遂有所谓＂梅妻鹤子＂之说。但林逋咏梅八首律诗中,所写多称＂小梅＂、＂孤根＂、＂一枝＂。同时文人造访其所,所见也以松竹为主,由此可见其隐所植梅不多。整个北宋时期孤山梅花分布也极有限。所谓＂梅妻鹤子＂说也不见于宋人著作,是后世的想象之辞。     

清末植树防灾思想述论

清末水旱灾害频仍，有识之士在批判传统的发放赈银赈粮以救灾荒方法的基础上，提出了植树防灾的思想。这种思想主张广植树木，改善被破坏的生态环境，以减少水旱灾害的发生。植树防灾思想是近代保护生态环境思想的先声。