大学MOOC Basic principles of steel structure(Chang'an University)1461586174 最新慕课完整章节测试答案

Unit test one

1、单选题：
Which of the following countries was the first to use steel structures in the world?​‏​
选项：
A: Germany
B: China
C: British
D: America
答案: 【 America】

2、单选题：
Which of the following countries was the first to use iron structures in the world?‌‍‌
选项：
A: China
B: America
C: British
D: Germany
答案: 【 China】

3、单选题：
‌Which material has the largest ratio of strength to density?‌
选项：
A: Timber
B: Concrete
C: Masonry
D: Steel
答案: 【 Steel】

4、多选题：
Which of the following are characteristics of the steel structure?‏‎‏
选项：
A: High strength and low weight
B: Good plasticity and toughness
C: Easy to manufacture and construct
D: Weak corrosion resistance
答案: 【 High strength and low weight;
Good plasticity and toughness;
Easy to manufacture and construct;
Weak corrosion resistance】

5、多选题：
Which of the following characteristics will increase the construction cost?‌‏‌
选项：
A: Good airtightness and water tightness
B: Weak fire resistance
C: High strength and low weight
D: Brittle fracture tendency under some states
答案: 【 Weak fire resistance;
Brittle fracture tendency under some states】

Unit test two

1、单选题：
Impact toughness is a comprehensive expression of strength and (  ).​​​
选项：
A: Elasticity
B: Stiffness
C: Stability
D:     Plasticity
答案: 【     Plasticity】

2、单选题：
For the tension test of carbon steel, which of the following values is the highest? (  )‏‍‏
选项：
A: Yield stress
B: Tensile strength
C:      Proportional limit
D: Elastic limit
答案: 【 Tensile strength】

3、单选题：
Q 460C is the (  ).‏
选项：
A: carbon structural steel
B:  forged steel
C: cast steel
D:    low alloy structural steel
答案: 【    low alloy structural steel】

4、单选题：
(   ) is an impurity component in carbon s