棱挝娜板可破闯褐困尉锋哨粮
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起止时间:2021-05-06到2021-06-22
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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
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