追求自然的解题方法

一、引言出现"懂而不会"现象的主要原因在于教师所给的解法技巧性太强,不是题目自然而然的解法.那么怎样的解法才是自然的解法?文[1]指出:自然的解法就是从题目条件出发,每一步跨度不大,容易想到,易于理解.不过判断一个解法是否自然,不同的人可能看法不一样.因为自然与否,和解题者本身的素养有很大关系,比如掌握案例的多少,联想能力,灵活运用能力等,难以一概而论,就好比"显然易见"一样,在你看来是显然的,可能别人要想半天.下面笔者结合解题教学中的几个片断,就所教学生具体情况谈谈教学中关于自然解法的思考,不妥之处恳请指正.     

海知道,我知道

在圣托里尼岛与一位摄影师结为好友。聊天中，他说他偶尔也会为一些新婚夫妻在伊亚拍摄婚纱照，拍摄过程中他发现一个很有趣的现象。“每个人都想要拍蓝天、大海、教堂的十字尖顶，以及号称世界上最美的日落。我对他们说，再走下去一点，会有很漂亮的巷子和小花，却很少有人愿意去拍。”     

浅谈建筑电气设计安装过程中常见的问题与预防

针对建筑电气设计安装过程中常见的问题与预防进行了分析。     

关于我国绿色建筑发展的探究

本文分析了我国绿色建筑的发展现状和存在问题,提出了符合我国国情的绿色建筑发展目标和发展策略.     

Architecture Singularity Analysis of 4-U■S/U■U 5-DOF Parallel Mechanism

Architecture singularity of a parallel mechanism with five degrees of freedom (DOF) is analyzed. Such mechanism consists of a movable platform connected to the base by five active limbs. Four of them are identical 6-DOF limbs and the last one has the same DOF as the specified DOF of the movable platform. Based on the kinematics analysis, two categories of architecture singularities for such mechanism are proposed. Then the sufficient condition for each singularity is researched. Results show that the mechanism is singular when it employs each category of the proposed architecture, provided that it satisfies the corresponding sufficient condition. It can be concluded that the proposed two categories of architecture singularities should be avoided with the following dimensional synthesis of such mechanism.