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第一章 单元测试
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:错
B:对
答案: 【对】
3、判断题：
Lakes and reservoir waters usually have low water mobility, high turbidity, and relatively stable water quality. ( )
选项：
A:错
B:对
答案: 【错】
4、判断题：
Heavy metals can be concentrated in plant roots or aquatic animals, causing great danger to living organisms. ( )
选项：
A:错
B:对
答案: 【对】
5、判断题：
In the US, different sewage plants follow the same discharge standards. ( )
选项：
A:错
B:对
答案: 【错】
第二章 单元测试
1、判断题：
Increasing ionic strength would compress the electric double layer and increase the stability of the colloid. ( )
选项：
A:对
B:错
答案: 【错】
2、判断题：
G value and GT value are employed to design coagulation tanks, because they can describe the coagulation process comprehensively. ( )
选项：
A:错
B:对
答案: 【错】
3、判断题：
The hydraulic condition of the rotary baffle plate flocculation tank is better than that of the reciprocating type, and head loss of the rotary type is 40% less than that of the reciprocating type. ( )
选项：
A:对
B:错
答案: 【对】
4、多选题：
There are many ways for the control of coagulant dosage and automatic detection, including ( ).
选项：
A:dosing according to experience
B:streaming current detector (SCD)
C:establishing a mathematical model according to the quantity and quality of raw water
D:light transmission pulsation detector
答案: 【streaming current detector (SCD);establishing a mathematical model according to the quantity and quality of raw water
;light transmission pulsation detector
】
5、单选题：
Which one below belongs to organic coagulant ( ).
选项：
A:lime glue
B:aluminum sulfate
C:polyacrylamide (PAM)
D:poly aluminum chloride (PAC)
答案: 【polyacrylamide (PAM)
】
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