伸缩杆原理工程图_伸缩杆原理三维图
问题详情
1.Thestreamflowsdownthewindingvalley,sometimesrapidly,sometimesslowly.Whenthestreamflowsdownthehighslope,itsplashesupcloudsofmist.Thestreamisclearandtransparent,andyoucanclearlyseethesandandstonesatthebottomofthestream.2,seetheconfidenceofthevillagers.The3Ddiagramoftheprincipleofthetelescopicpole.Theelectrictoycarisnotadangerousandexplosiveitem.Therearenotransportationrestrictionsanditcanbebrought.
参考答案
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