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1、成功需要基础7年级《丰富的图形世界》拓展训练能力需要方法展开与折叠题型：平面图形折叠成正方体例下图是一个正方体木块的表面展开图，若在正方体的各面填上数，使得对面两数之和为7，则A,B,C处填的数各是多少？变式1.如图，一个正方体的三个面上分别写有1,2,3，与它们相对的三个面上依次写有6,5,4.这个正方体的每一条棱处嵌有一根金属条，每根金属条的质量数（单位：克）等于过该棱的两个面上所写数的平均数。（1）这个正方体各棱上所嵌金属条的质量总和为克。（2）沿这个正方体的某些棱（连同嵌条）剪开，得到图2所示的展开图，其周边棱上
2、金属条质量之和的最小值为克。在图2中把这个正方体的六个面上原有的数字写出来。图1图22.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。appearanceoftheweldappearancequalitytechnicalrequirementsoftheprojectmustnothaveamoltenmetalstreamdoesnotmeltt
3、hebasemetaltoweld,weldseamandheat-affectedzonesurfacemustnothavecracks,pores,defectssuchascraterandash,surfacesmoothing,weldandbasemetalshouldbeevenlysmoothtransition.Width2-3mmfromtheedgeofweldGroove.Surfacereinforcementshouldbelessthanorequalto1+0.2timestheslop
4、eedgewidth,andshouldnotbegreaterthan4mm.Depthofundercutshouldbelessthanorequalto0.5mm,totallengthoftheweldsonbothsidesundercutnotexceed10%oftheweldlength,andlongcontinuousshouldnotbegreaterthan100mm.Wrongsideshouldbelessthanorat0.2T,andshouldnotbegreaterthan2mm(w
5、allthicknessmmt)incompleteornotallow7.57.5.1installationqualityprocessstandardsoftheelectricalenclosureCabinetsurfaceisclean,neat,nosignificantphenomenonofconvex,closetonature,closethedoor.7.5.2CabinetCabinetfacepaintsnopaint,returnedtorusted,consistentcolor.7.5.
6、3uniformindirectgapfromtoptobottom,slotwidth<1.5mm7.5.4adjacentCabinetsurfaceroughnessis0.7.5.5thecabinetsfirmlyfixed,craftsbeautiful.7.5.6Cabinetsurfacegauge,switchcabinetmarkclear,neat,firmpaste.7.5.7Terminalrowofneat,isreliable,theappearanceiscleanandnotdamage
7、d.7.5.8cablesneatandclean,solidbinding,bindingprocessinappearance.7.5.9thefirstcableproductionfirm,craftsbeautiful,clearsignagedoesnotfade.7.5.10fireproofpluggingtight,nocracksandpores.7.67.6.1ofthestandardelectricalwiringqualitytechnologycablea,themulti-corewire
8、buncharrangementshouldbeparalleltoeachother,horizontalwireharnessorwireshouldbeperpendiculartothelongitudinalmulti-corewirebunch.Thedistancebetweenthewireharne
