大学MOOC Water Quality Engineering(Harbin Institute of Technology)1461249167 最新慕课完整章节测试答案

1 Water cycle and water quality standards

1、多选题：
​The challenges of urban water resources include ( )​​​
选项：
A: Urban water distribution renders large energy consumption.
B: Capital and operational costs of water supply for long distance transportation are high.
C: High risk of urban water pollution.
D: The standards of urban water quality are high due to the increasing concerns about the safety of urban water sources.
答案: 【 Urban water distribution renders large energy consumption.;
Capital and operational costs of water supply for long distance transportation are high.;
High risk of urban water pollution.;
The standards of urban water quality are high due to the increasing concerns about the safety of urban water sources.】

2、判断题：
‌It is relatively hard to separate salt from water, because ions such as Ca2+，Mg2+，K+ are tightly surrounded by water molecules.​
选项：
A: 正确
B: 错误
答案: 【 正确】

3、判断题：
‏Lakes and reservoir waters usually have low water mobility, high turbidity, and relatively stable water quality. ‎
选项：
A: 正确
B: 错误
答案: 【 错误】

4、判断题：
‍Heavy metals can be concentrated in plant roots or aquatic animals, causing great danger to living organisms. ​
选项：
A: 正确
B: 错误
答案: 【 正确】

5、判断题：
‎In the US, different sewage plants follow the same discharge standards.‎
选项：
A: 正确
B: 错误
答案: 【 错误】

2 Coagulation theory and technology

1、单选题：
‎Which one below belongs to organic coagulant ( )​
选项：
A: polyacrylamide (PAM)
B: aluminum sulfate
C: lime glue
D: poly aluminum chloride (PAC)
答案: 【 polyacrylamide (PAM)】

2、多选题：
‍There are many ways for the control of coagulant dosage and automatic detection, including ( ).‏
选项：
A: establishing a mathematical model according to the quantity and quality of raw water
B: streaming current detector (SCD)
C: dosing according to experience
D: light transmission pulsation detector
答案: 【 establishing a mathematical model according to the quantity and quality of raw water;
streaming current detector (SCD);
light transmission pulsation detector】

3、判