2020 材料科学基础（上）(西北工业大学)1450377491 最新满分章节测试答案

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本课程起止时间为:2020-02-24到2020-06-26
本篇答案更新状态:已完结

【作业】绪论 Introduction Term Paper

1、 问题:Term paper and oral presentation.Introducing a kind of new material you are interested in. Requirments are attched.
评分规则: 【 The total points for this homework is 100. Two students are required to work together for both parts, and points will be given according to their efforts.
】

第一章 原子结构及键合 Atomic structure and bonding 第一章 原子结构及键合 测验

1、 问题:Ionic bonding is formed by ( )
选项：
A:valence electron transfer‍
B:shared electron pair
C:free electron and cation
D:attraction of the electric dipoles
答案: 【valence electron transfer‍】

2、 问题:Covalent bonding is formed by ( )
选项：
A:shared electron pair
B:valence electron transfer
C:free electron and cation
D:attraction of the electric dipoles
答案: 【shared electron pair】

3、 问题:Metallic bonding is formed by ( )
选项：
A:free electron and cation
B:valence electron transfer
C:shared electron pair
D:attraction of the electric dipoles
答案: 【free electron and cation】

4、 问题:Crystals which are mainly formed by metallic bonding
选项：
A:hardness is either high or low
B:solid conductive
C:liquid conductive
D:high melting point
E:poor plasticity
答案: 【hardness is either high or low ;
solid conductive ;
liquid conductive】

5、 问题:Crystals which are mainly formed by ionic bonding:
选项：
A:high melting point
B:poor plasticity
C:low hardness
D:solid conductive
E:liquid non-conductive
答案: 【high melting point;
poor plasticity 】

6、 问题:Molecular bonds are directional.
选项：
A:正确
B:错误
答案: 【错误】

7、 问题:Hydrogen bonding is directional.
选项：
A:正确
B:错误
答案: 【正确】

8、 问题:Generally speaking, the bonding energy of ionic bonding is stronger than that of covalent bonding.
选项：
A:正确
B:错误
答案: 【正确】

9、 问题:Covalent bonding is directional.
选项：
A:正确
B:错误
答案: 【正确】

10、 问题:The bonding energy of metallic bonding varies greatly.
选项：
A:正确
B:错误
答案: 【正确】

11、 问题:Metallic bonding is directional.
选项：
A:正确
B:错误
答案: 【错误】

第二章 晶体的结构 (一）：晶体结构与空间点阵 Crystal structure and space lattice 第二章 晶体的结构（一）：测验

1、 问题:Cubic crystal system includes：
选项：
A:simple cubic
B:face-centered cubic
C:body-centered cubic
D:base-centered cubic
答案: 【simple cubic;
face-centered cubic;
body-centered cubic】

2、 问题:Orthorhombic crystal system includes:
选项：
A:simple orthorhombic
B:base-centered orthorhombic
C:face-centered orthorhombic
D:body-centered orthorhombic
答案: 【simple orthorhombic;
base-centered orthorhombic;
face-centered orthorhombic;
body-centered orthorhombic】

3、 问题:The types of crytsal structure are countless.
选项：
A:正确
B:错误
答案: 【正确】

4、 问题:All the points within the crystal structure and space lattice represent real atoms.
选项：
A:正确
B:错误
答案: 【错误】

5、 问题:Similar crystal structures can belong to different space lattices.
选项：
A:正确
B:错误
答案: 【正确】