L.A)amorphous,B)crystalline答案与顺序无关 2. A)allotropic,B)polymorphic vacancy 5.interstitial 6 substitutional 7 Mohs test 8. torsional yield strength Scleroscope(HSc)test 10.Alkanes V.True or false questions.If you think the statement is true,write the letter"T"; otherwise,write the letter"F"(15points,Ipt/Q) 1.F 6.F 11.T 2F 7.F 12F 3.T 8.F 13.T 4.T 9.T 14.T 5 10.F 15.F VI.Give a simple answer to the following questions(10points) 1.(3points) There are seven crystal systems and atoms can form total 14 Brevais lattices with these seven crystal systems.There are three types of unit cell for cubic crystal system,including simple cubic unit cell (sc).body-centered cubic unit cell (bcc).and face-centered cubic unit cell (fcc) 2.(3points) The two methods of measuring ductility are and percent reduction inarea. eotio(where is the length at fracture,o isthe original lengh %reduction in area=(AA100%)/A0,where A:is the cross-sectional area at fracture,Ao is the original cross-sectional area. A material that has 5%or less elongation is considered as a brittle material. 3. (3points) When it is heated deliberately,the metal rod will absorb heat,expand and transfer heat.The absorption of heat,thermal expansion and heat transmission are characterized by specific heat, coefficient of (linear)thermal expansion and thermal conductivity.respectivelv. 4.(Ipoints) The amount of creep and springback VII.Complex questions.(10points) 1.(2pts) PDF文件使用"pdfFactory Pro”试用版本创建w,fineprint,con.cn2 1. A) amorphous, B) crystalline 答案与顺序无关 2. A) allotropic, B) polymorphic 3. interstitialcy 4. vacancy 5. interstitial 6. substitutional 7. Mohs test 8. torsional yield strength 9. Scleroscope (HSc) test 10. Alkanes V. True or false questions. If you think the statement is true, write the letter “T”; otherwise, write the letter “F” (15points, 1pt/Q) 1. F 2. F 3. T 4. T 5. T 6. F 7. F 8. F 9. T 10. F 11. T 12. F 13. T 14. T 15. F VI. Give a simple answer to the following questions (10points) 1. (3points) There are seven crystal systems and atoms can form total 14 Brevais lattices with these seven crystal systems. There are three types of unit cell for cubic crystal system, including simple cubic unit cell (sc), body-centered cubic unit cell (bcc), and face-centered cubic unit cell (fcc). 2. (3points) The two methods of measuring ductility are percent elongation and percent reduction in area. % elongation=( (lf-l0)×100%)/l0, where lf is the length at fracture, l0 isthe original length % reduction in area=(A0-Af)×100%)/A0, where Af is the cross-sectional area at fracture, A0 isthe original cross-sectional area. A material that has 5% or less elongation is considered as a brittle material. 3. (3points) When it is heated deliberately, the metal rod will absorb heat, expand and transfer heat. The absorption of heat, thermal expansion and heat transmission are characterized by specific heat, coefficient of (linear) thermal expansion and thermal conductivity, respectively. 4. (1points) The amount of creep and springback. VII. Complex questions. (10points) 1. (2pts) PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn