第一章 单元测试

1、 问题:( )意义的发展是指前进的变化或进化,是事物从一种质态转变为另一种质态,或从一种运动形式中产生出另一种运动形式的过程。
选项:
A:哲学
B:历史学
C:经济学
D:文化学
答案: 【
哲学
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绪论 单元测试

1、 问题:

Which of the following saying are correct   .

选项:
A:Microbiological treatment technologies developed at the beginning of the 20th century, such as activated sludge and anaerobic digestion, remain mainstays today.
B: Empiricism is very important in environmental biotechnology besides the principles of microbiology and engineering.
C:Quantification analysis makes processes reliable and cost-effective.
D:Molecular biology is the substitute for traditional methods in exploring microbial communities.
答案: 【
Microbiological treatment technologies developed at the beginning of the 20th century, such as activated sludge and anaerobic digestion, remain mainstays today.
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第一章 单元测试

1、 问题:

A和B二物质紫外-可见吸收光谱参数如下:物质 l1时的摩尔吸收系数l2时的摩尔吸收系数/[L/(moL·cm)]

A  4,120  0.00

B  3,610  300  

若此二种物质的某溶液在l1时在25px 吸收池中测得A0.754,在l2时于250px  吸收池中测得A0.240,问B的浓度是多少?(    

选项:
A:0.64×10-5mol/L
B:0.80×10-5 mol/L 
C:0.64×10-4mol/L
D:0.80×10-4mol/L
答案: 【
0.80×10-4mol/L
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