丰富的图形世界教案初一

世界观人人都有，而哲学只有经过系统的学习的人才能掌握它。世界观是自发成的，是不系统的、不自觉的、缺乏严密的逻辑和理论论证，而哲学则是把自发的、零散的、朴素的世界观加以理论化和系统化，因而具有严密的逻辑和完整的理论体系。appearanceoftheweldappearancequalitytechnicalrequirementsoftheprojectmustnothaveamoltenmetalstreamdoesnotmeltthebasemetaltoweld,weldseamandheat-affectedzonesurfacemustnothavecracks,pores,defectssuchascraterandash,surfacesmoothing,weldandbasemetalshouldbeevenlysmoothtransition.Width2-3mmfromtheedgeofweldGroove.Surfacereinforcementshouldbelessthanorequalto1+0.2timestheslopeedgewidth,andshouldnotbegreaterthan4mm.Depthofundercutshouldbelessthanorequalto0.5mm,totallengthoftheweldsonbothsidesundercutnotexceed10%oftheweldlength,andlongcontinuousshouldnotbegreaterthan100mm.Wrongsideshouldbelessthanorat0.2T,andshouldnotbegreaterthan2mm(wallthicknessmmt)incompleteornotallow7.57.5.1installationqualityprocessstandardsoftheelectricalenclosureCabinetsurfaceisclean,neat,nosignificantphenomenonofconvex,closetonature,closethedoor.7.5.2CabinetCabinetfacepaintsnopaint,returnedtorusted,consistentcolor.7.5.3uniformindirectgapfromtoptobottom,slotwidth1.5mm7.5.4adjacentCabinetsurfaceroughnessis0.7.5.5thecabinetsfirmlyfixed,craftsbeautiful.7.5.6Cabinetsurfacegauge,switchcabinetmarkclear,neat,firmpaste.7.5.7Terminalrowofneat,isreliable,theappearanceiscleanandnotdamaged.7.5.8cablesneatandclean,solidbinding,bindingprocessinappearance.7.5.9thefirstcableproductionfirm,craftsbeautiful,clearsignagedoesnotfade.7.5.10fireproofpluggingtight,nocracksandpores.7.67.6.1ofthestandardelectricalwiringqualitytechnologycablea,themulti-corewirebuncharrangementshouldbeparalleltoeachother,horizontalwireharnessorwireshouldbeperpendiculartothelongitudinalmulti-corewirebunch.Thedistancebetweenthewireharnessandwireharnesssymmetry,andascloseaspossible.B-corewiringharnessintoround,multi-corewirebunchusedgwirebinding,fastening一线教师授课讲义（班级）校区：西高教育中心授课日期:2015.2.9班级名称七年级科目数学授课时间13:00—21:00模块丰富的图形世界本节课知识重难点重点：正方体的展开与折叠、截面与从三个方向看物体；难点：展开与折叠；授课内容1、几何图形：从实物中抽象出来的各种图形，包括立体图形和平面图形。立体图形：有些几何图形的各个部分不都在同一平面内，它们是立体图形。平面图形：有些几何图形的各个部分都在同一平面内，它们是平面图形。2、生活中的立体图形圆柱：（圆柱的侧面是曲面，底面是圆）柱棱柱：三棱柱、四棱柱（长方体、正方体）、五棱柱、……（棱柱的侧面是若干个小长方形构成，底面是多边形）生活中的立体图形圆（圆的各个面都是圆）(按名称分)圆锥（圆锥的侧面是曲面，底面的圆）锥棱锥（棱锥的侧面是若干个三角形构成，底面是多边形）3、棱柱及其有关概念：棱：在棱柱中，任何相邻两个面的交线，都叫做棱。侧棱：相邻两个侧面的交线叫做侧棱。n棱柱有两个底面，n个侧面，共（n+2）个面；3n条棱，n条侧棱；2n个顶点。例1.下列说法错误的是（B）A．长方体、正方体都是棱柱B．三棱柱的侧面是三角形C．直六棱柱有六个侧面、侧面为长方形世界观人人都有，而哲学只有经过系统的学习的人才能掌握它。世界观是自发成的，是不系统的、不自觉的、缺乏严密的逻辑和理论论证，而哲学则是把自发的、零散的、朴素的世界观加以理论化和系统化，因而具有严密的逻辑和完整的理论体系。appearanceoftheweldappearancequalitytechnicalrequirementsoftheprojectmustnothaveamoltenmetalstreamdoesnotmeltthebasemetaltoweld,weldseamandheat-affectedzonesurfacemustnothavecracks,pores,defectssuchascraterandash,surfacesmoothing,weldandbasemetalshouldbeevenlysmoothtransition.Width2-3mmfromtheedgeofweldGroove.Surfacereinforcementshouldbelessthanorequalto1+0.2timestheslopeedgewidth,andshouldnotbegreaterthan4mm.Depthofundercutshouldbelessthanorequalto0.5mm,totallengthoftheweldsonbothsidesundercutnotexceed10%oftheweldlength,andlongcontinuousshouldnotbegreaterthan100mm.Wrongsideshouldbelessthanorat0.2T,andshouldnotbegreaterthan2mm(wallthicknessmmt)incompleteornotallow7.57.5.1installationqualityprocessstandardsoftheelectricalenclosureCabinetsurfaceisclean,neat,nosignificantphenomenonofconvex,closetonature,closethedoor.7.5.2CabinetCabinetfacepaintsnopaint,returnedtorusted,consistentcolor.7.5.3uniformindirectgapfromtoptobottom,slotwidth1.5mm7.5.4adjacentCabinetsurfaceroughnessis0.7.5.5thecabinetsfirmlyfixed,craftsbeautiful.7.5.6Cabinetsurfacegauge,switchcabinetmarkclear,neat,firmpaste.7.5.7Terminalrowofneat,isreliable,theappearanceiscleanandnotdamaged.7.5.8cablesneatandclean,solidbinding,bindingprocessinappearance.7.5.9thefirstcableproductionfirm,craftsbeautiful,clearsignagedoesnotfade.7.5.10fireproofpluggingtight,nocracksandpores.7.67.6.1ofthestandardelectricalwiringqualitytechnologycablea,themulti-corewirebuncharrangementshouldbeparalleltoeachother,horizontalwireharnessorwireshouldbeperpendiculartothelongitudinalmulti-corewirebunch.Thedistancebetweenthewireharnessandwireharnesssymmetry,andascloseaspossible.B-corewiringharnessintoround,multi-corewirebunchusedgwirebinding,fasteningD．球体的三种视图均为同样大小的图形棱柱由上下两个底面以及侧面组成；上下两个底面可以是全等的多边形，所以表面可能出现三角形；侧面是四边形．长方体、正方体符合．三棱柱的侧面是应是四边形．4、点、线、面、体（1）几何图形的组成点：线和线相交的地方是点，它是几何图形中最基本的图形。线：面和面相交的地方是线，分为直线和曲线。面：包围着体的是面，分为平面和曲面。体：几何体也简称体。（2）点动成线，线动成面，面动成体。例2.小军将一个直角三角板（如图）绕它的一条直角边所在的直线旋转一周形成一个几何体，将这个几何体的侧面展开得到的大致图形是（）A．B．C．D．直角三角板（如图）绕它的一条直角边所在的直线旋转一周形成一个圆锥，那么它的侧面展开得到的图形是扇形．5、正方体的平面展开图：11种总结：中间四个面，上下各一面；中间三个面，一二隔河见；中间两个面，楼梯天天见；中间没有面，三三连一线例3.将如图所示表面带有图案的正方体沿某些棱展开后，得到的图形是（）3—3型2—2—2型世界观人人都有，而哲学只有经过系统的学习的人才能掌握它。世界观是自发成的，是不系统的、不自觉的、缺乏严密的逻辑和理论论证，而哲学则是把自发的、零散的、朴素的世界观加以理论化和系统化，因而具有严密的逻辑和完整的理论体系。appearanceoftheweldappearancequalitytechnicalrequirementsoftheprojectmustnothaveamoltenmetalstreamdoesnotmeltthebasemetaltoweld,weldseamandheat-affectedzonesurfacemustnothavecracks,pores,defectssuchascraterandash,surfacesmoothing,weldandbasemetalshouldbeevenlysmoothtransition.Width2-3mmfromtheedgeofweldGroove.Surfacereinf