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1、二元一次方程组主题单元教学设计主题单元标题二元一次方程组作者姓名所属单位联系地址联系电话电子邮箱邮政编码学科领域（在内打√表示主属学科，打+表示相关学科）思想品德音乐化学信息技术劳动与技术语文美术生物科学√数学外语历史社区服务体育物理地理社会实践其他（请列出）：适用年级七年级所需时间课内6课时，课外2课时主题单元学习概述本章与一元一次方程类似，强调建模思想，关注知识的形成与应用过程。为此，教科书设计继续遵循“问题情境—建立模型—解释、拓展与应用”的模式，首先通过具体问题情境，建立有关方程并归纳出二元一次方程和二元一次方程组的有关概念，然后探索其各
2、种解法，并在现实情境中加以应用，切实提高学生的应用意识和能力。rV-6/1.5M312012.1215160goodshopairspraygun(zinc)ZQP-22Shanghai20092012.1216113goodworkshoprustsandblastingmachine1set20082012.1217123goodworkshopmanualhoist,ShanghaiZhejiangWuling20113T/5T12136goodworkshop2012.1218highpressureAirlesssprayingmach
3、ineKing56:11Shanghai20052012.121925goodworkshopanglegrinderP1254Germany201160goodshoptop0.5T~10T122012.1220,000poundsChina's200950goodshop2012.1221magneticdrill/hand...Centerheightinstallationforbase,eachinstalledsegmentbothupanddown,leftandrightdimension.Heightdeviationcontr
4、olwithin2mm.Suchassteel,reinforcingTianDing,concrete-reinforcedconcrete.Mingfollowinghalfofthestartingunit,fromtheplanttothereversedirectionofflowsectiononinstallation.4)installationerectedonsitedesigncablecrane3tonmachine,usingacablemachinehoistingsteelpipe.Cableselection¢24
5、mm*maincable,with¢15mmsteelwireropeforliftingandtowingropes,hauling,liftingmachinesof5tons*2.5)installationinstallationprocessasfollows:lifting→→connection→adjust→fixedtouchup→→→welding→cleaningpolishingcompleted.AccordingtotheconstructionunitstoprovidethetownPierandverticalc
6、ontrolpoints,afterithasbeenchecked,surveyreleasetubeinstallationrequiredbythebuttressofthetowncenterandvertical,steelpipeisinplace,withstrings,hammerline,horizontalpipeandsteeltapemeasurepipeandelevation.Preliminaryfixingofseams,takingintoaccountthepipeCenternottoshift,steelp
7、ipeseam,fixedwithangle(angleironagainstthebaseatoneendandtemporaryweldingofweldingandsteeltubes),guaranteedbysectionsteelpipejointsnottoshift.Pipejointswithwedgeplates,zfontcodeandscrewTURNBUCKLEtie,alsobyshearingtoolscheckandclearance,hammer,levelandlinepipeandsteeltaperepea
8、tedorificeandpipestraightness.FixedpipeafterthedeviationoftheDL5017s
