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第一章 单元测试
1、单选题：
With carbon equivalent ( ), the steel has a low tendency to harden and cold cracking?
选项：
A:less than 0.50%
B:less than 0.80%
C:less than 0.60%
D:less than 0.40%
答案: 【less than 0.40%】
2、单选题：
( ) is not a factor that affects weldability.
选项：
A:operation skill
B:chemical composition
C:joint type
D:Welding process
答案: 【operation skill】
3、多选题：
The calculation formula of carbon equivalent of the IWS considers the influence of () on weldability.
选项：
A:chemical composition
B:diffusion hydrogen
C:welding process
D:welding structure 
答案: 【diffusion hydrogen;welding process;welding structure 】
4、单选题：
Maximum crack distance has been used to allow more accurate determination of the cracking ( ) range.
选项：
A:strength
B:toughness
C:size
D:temperature
答案: 【temperature】
5、多选题：
Weldability is not easily quantified, and can depend on a variety of factors, including ( ).
选项：
A:operator and welder
B:physical specifics of the joint
C:welded structure
D:welding method
答案: 【physical specifics of the joint;welded structure;welding method】
第二章 单元测试
1、单选题：
The weldability of high-carbon steel is worse than that of low-carbon steel because high-carbon steel is with ( ).
选项：
A:higher carbon content
B:lower melting point
C:higher sulphur content
D:higher toughness
答案: 【higher carbon content】
2、单选题：
Normally, because of auto-tempering, the postweld microstructure of QTLA steel is ( ).
选项：
A:high carbon martensite
B:tempered martensite
C:ledeburite
D:upper bainite
答案: 【tempered martensite】
3、多选题：
QTLA steel is not susceptible to solidification cracking because it is with ( ).
选项：
A:low impurity content
B:low carbon content
C:low manganese content
D:low nickel content
答案: 【low impurity content;low carbon content】
4、多选题：
For HTLA steels, chromium is able to ( ).
选项：
A:decrease toughness of HTLA steels
B:increase toughness of HTLA steels
C:increase hardeness of HTLA steels
D:decrease hardeness of HTLA steels
答案: 【decrease toughness of HTLA steels;increase hardeness of HTLA steels】
5、判断题：
When you weld HTLA steels, you”d better to take advantage of auto-tempering.
选项：
A:对
B:错
答案: 【错】
6、多选题：
Auto-tempering occurs after welding when ( ).
选项：
A:peak temperature is high
B:Ms is high
C:carbon content of weld is low
D:cooling rate is slow
答案: 【carbon content of weld is low;cooling rate is slow】
7、判断题：
Before designing welding procedure, we”d better to analyze the weldability of the workpiece.
选项：
A:对
B:错
答案: 【对】
8、判断题：
To remedy the underbead cracking, we need to reduce cooling rate when we weld oil engine connecting rod.
选项：
A:错
B:对
答案: 【对】
9、单选题：
If the carbon content of a type of steel is 0.1%, this steel is a kind of ( ).
选项：
A:medium-carbon steel
B:HTLA steel
C:high-carbon steel
D:low-carbon steel
答案: 【low-carbon steel】
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