作业2. 材料科技英语的理解：材料性能 Understanding EMST： Properties of Materials 单元作业1
1、 Please read “Elastic and Plastic Properties of Metals” in the unit “Properties of Materials”. Which sentence is the topic sentence in the second paragraph? Point out the sentence and copy it, then translate it into Chinese.
评分规则: 主题句：第2句话Elasticity involves the relationship between stress and strain.正确：得4分；如选择第1句话，得3分；选择其它句子，得1~2分。
翻译：弹性表明了应力和应变之间的关系。正确：得3分；如将involves译成除 “表明” 外的其它中文，得2分。
2. 材料科技英语的理解：材料性能 Understanding EMST： Properties of Materials 单元测验1
1、 单选题：carbohydrate的意思是
A:碳水化合物
B:碳化合物
C:碳氢化物
D:含碳物
答案: 碳水化合物
2、 单选题：The term specific strength means
A:strength to weight ratio
B:special strength
C:strength to density ratio
D:strength to volume ratio
答案: strength to weight ratio
3、 单选题：In a solid solution, solute atoms substitute for lattice atoms. The type of this solid solution is
A:substitutional solid solution
B:interstitial solid solution
C:solid solution
D:none
答案: substitutional solid solution
4、 单选题：A silicon crystal doped with boron creates a p-type semiconductor. This doping is known as
A:acceptor doping
B:donor doping
C:adding impurities
D:none
答案: acceptor doping
5、 单选题：Ferroelectricity of donor-doped barium titanate ceramics is lost at a certain temperature, and this temperature is called
A:the Curie temperature
B:the critical temperature
C:the glass transition temperature
D:the melting point
答案: the Curie temperature
6、 单选题：PTC ceramics have a （?） resistance at ordinary temperatures.
A:low
B:high
C:constant
D:varying
答案: low
7、 单选题：Titanium alloys are virtually （?） to air, marine, and a variety of industrial environments.
A:immune
B:sensitive
C:stable
D:active
答案: immune
8、 多选题：Why is titanium used in artificial replacement joints？
A:It is the most biocompatible metal known.
B:It has a stiffness similar to that of the human bone.
C:It has a high specific strength.
D:It is expansive.
答案: It is the most biocompatible metal known.;
It has a stiffness similar to that of the human bone.
9、 多选题：The temperature sensitive ceramics are
A:PTC ceramics
B:NTC ceramics
C:insulating ceramics
D:conductive ceramics
答案: PTC ceramics;
NTC ceramics
3. 材料科技英语的理解：材料结构 Understanding EMST： Structure of Materials 随堂测验
1、 单选题：The central feature of crystalline structure is that it is regular and（?）.
A:random
B:repeating
C:unordered
D:amorphous
答案: repeating
2、 单选题：In a glass, short-range order is retained, long-range order is（?）.
A:lost
B:remained
C:kept
D:present
答案: lost
A:least
B:most
C:best
D:better
答案: least
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