2012/2/15 Georoinmc The evolution of structural materials Strength-Density 1900A0 McKniey 1297-190 10 10 Dersity.p (Mgm 材料科学与工程学院 11 School of Materials Science and Engineering. 国 Ge9鼎 The evolution of structural materials 形 Strength-Density Present day 70 10 a Densy.(Mg/m 0 材料科学与工程学院 12 School of Materials Science and Engineering. 62012/2/15 6 材料科学与工程学院 School of Materials Science and Engineering 11 材料科学与工程学院 School of Materials Science and Engineering 12