EngineeringMaterials,Unit1,工程材料,TestingBeforeClass：,Whichstateofironhascommercialuse(radio),EngineeringMaterials,Nonmetallicmaterials,Metallicmaterials,EngineeringMaterials,Inthedesignandmanufactureofaproduct,itisessentialthatthematerialandtheprocessbeunderstood.Materialsdifferwidelyinphysicalproperties,machinabilitycharacteristics,methodsofforming,andpossibleservicelife.Thedesignershouldconsiderthesefactsinselectinganeconomicalmaterialandaprocessthatisbestsuitedtotheproduct.Engineeringmaterial
