急!!!!!!!!!關於Chem的問題
回答 (1)
2007-11-01 5:31 pm
✔ 最佳答案
"Hard" is a material just has very high tensile modulus / tensile strength but may has not so high elongation at fracture i.e. brittle. E.g. Tungsten"Strong" is a material has high tensile modulus / tensile strength and high elongation at fracture i.e. have some degree of deform before fracture. E.g. Steel
參考: Myself
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