2022 材料科学与工程基础（英文）(南京航空航天大学)1467117557 最新满分章节测试答案

本答案对应课程为:点我自动跳转查看
本课程起止时间为:2022-02-19到2022-06-19

【作业】Chapter 1 Introduction Chapter 1 Questions and Problems

1、 问题:One point one question
评分规则: 【 If you correctly answer all the five questions, you will get 5 points.
】

【作业】Chapter 2 Bonding Chapter 2 Questions and Problems

1、 问题:One point one question
评分规则: 【 One point one question
】

Chapter 2 Bonding Test 1

1、 问题:Atomic weight (A) of an element corresponds to the weighted average of the atomic masses of the atom’s naturally occurring _____.
选项：
A:ions
B:charges
C:isotopes 
D:particles
答案: 【isotopes 】

2、 问题:Which of the following is NOT an example of primary bonding?
选项：
A:Van der Waals
B:ionic
C:covalent
D:metallic
答案: 【Van der Waals】

3、 问题:Covalent bonding occurs as a result of ___ sharing.
选项：
A:proton
B:electron
C:neutron
D:none of them
答案: 【electron】

4、 问题:Bonds in most metals are referred to as ______.
选项：
A:Directional
B:Ionic
C:Non-directional
D:Covalent
答案: 【Non-directional】

5、 问题:If the electron configuration of Fe is 1s2 2s2 2p6 3s2 3p6 3d6 4s2, then the electron configurations for the Fe3+ is 1s2 2s2 2p6 3s2 _____.
选项：
A:3p6 3d5
B:3p8 3d3
C:3d6 3p5
D:3d6 4s2 4p3
答案: 【3p6 3d5】

Chapter 5 Diffusion Test 2

1、 问题:How many atoms does the face centered cubic unit cell contain?
选项：
A:Two 
B:Four 
C: Three
D:One
答案: 【Four 】

2、 问题:The crystal structure of Cu is          ?
选项：
A:Simple cubic
B:FCC 
C: BCC
D:HCP
答案: 【FCC 】

3、 问题:The coordination number of BCC crystal structure is               .
选项：
A:2
B:4
C:6
D:8
答案: 【8】

4、 问题:The atomic packing factor for FCC is                  .
选项：
A:0.74 
B:0.68
C: 0.8
D: 1
答案: 【0.74 】

5、 问题:Interstitial solid solution belongs to                       .
选项：
A:infinite solid solution; 
B:finite solid solution;
C:unhomogeneous solid solution ;
D:substitutional solid solution
答案: 【finite solid solution; 】

6、 问题:Substitutional atom (impurity) is an example of ______.
选项：
A:point defect 
B:linear defect
C:planar defect
D:bulk defect
答案: 【point defect 】

7、 问题:One explanation for why graphite powder acts so well as a “solid lubricant”is               .
选项：
A:carbon atoms in graphite are covalently bonded within planar layers but have weaker secondary bonds between layers
B:finely-powdered carbon has many unsatisfied bonds at the particle surfaces, which act as a “sea of electrons”to cause lubrication
C:when crushed into a fine powder, graphite establishes a “polar” distribution of charge, leading to Coulombic repulsion between powder particles
D:None of above
答案: 【carbon atoms in graphite are covalently bonded within planar layers but have weaker secondary bonds between layers】

8、 问题:A ____ may form when impurity atoms are added to a solid, in which case the original crystal structure is retained and no new phases are formed.
选项：
A:defect
B:solid solution 
C:chemical compound
D:metal
答案: 【solid solution 】

9、 问题:Edge and screw dislocations differ in what way?
选项：
A:1 magnitude of their Burgers vectors.
B:line direction is straight (edge) or curved (screw).
C:angle between Burgers vector and line direction.
D:None of above
答案: 【angle between Burgers vector and line direction.】

10、 问题:Vacancy diffusion is usually     interstitial one.
选项：
A:slower than 
B:faster than 
C: similar to
D: equal to
答案: 【slower than 】

【作业】Chapter 7 Dislocations and strengthening mechanisms Chapter 7 Questions and Problems

1、 问题:Chapter 7
评分规则: 【 One question one point
】

【作业】Chapter 9 Phase transformations Chapter 9 Questions and Problems

1、 问题:Chapter 9 Questions and Problems
评分规则: 【 One question one point
】

Chapter 6 Mechanical properties Test 3

1、 问题:Strain Hardening is also named as                .
选项：
A: hot working;
B:metal forming; 
C:work hardening
D:annealing

请输入手机号或商家订单号

打不开请联系客服QQ 2356025045 商家订单号在哪里？点此了解

---

商家订单号查看步骤

打开支付宝

方法一：我的 > 账单 > 账单详情 > 更多>复制商家订单号

方法二：我的 > 账单 >搜索关键字【网课小帮手】
> 账单详情 > 更多>复制商家订单号

方法三：联系客服QQ 2356025045

微信支付

我 > 支付 > 钱包 > 账单 > 账单详情

手机号用于查询订单，请认真核对

支付宝