大学MOOC 环境分析化学(成都理工大学)1206682806 最新慕课完整章节测试答案

Chapter 1单元测验

1、单选题：
‌There are sme stages of overall analytical process in an environmental investigation.Which of the following are correct?（   ）‎‌‎‌a.definition of the aims；‎‌b.selection and development of appropriate method；‎‌c.sampling plan，sample collection，sample handing and pretreatment；‎‌d.separations；‎‌e.final measurements;‎‌f.method validation;‎‌g.assessment and interpretation of results;‎‌h.safety.‎‌‎
选项：
A: abcefgh
B: abcdefh
C: abcdefgh
D: abcdefg
答案: 【 abcdefgh】

2、多选题：
‍关于环境分析化学的特点，以下说法正确的是（   ）‌
选项：
A: 研究对象范围广；研究内容简单；研究组分的多变性
B: 研究组分的含量低；分析测试技术涉及的专业面越来越广，综合性越来越强
C: 研究对象范围广；研究内容复杂；研究组分的多变性
D: 研究组分的含量高；分析测试技术涉及的专业面越来越广，综合性越来越强
答案: 【 研究组分的含量低；分析测试技术涉及的专业面越来越广，综合性越来越强;
研究对象范围广；研究内容复杂；研究组分的多变性】

3、判断题：
‍环境分析化学是环境化学的一个重要组成部分，是开展环境科学研究不可缺少的基础。它是研究环境污染物的组成、结构、状态以及含量的基础化学的一个新分支。从某种意义上讲，环境科学的发展依赖于环境分析化学的发展。‎
选项：
A: 正确
B: 错误
答案: 【 错误】

Chapter 2单元测验

1、单选题：
Which is（are）the outlier（s）form the following set of replicate measurements？(   )‎3.41, 3.49, 3.25, 3.52, 3.42, 3.46‎‍‎
选项：
A: 3.25
B: 3.52
C: 3.25 and 3.52
D: none
答案: 【 3.25】

2、单选题：
Two sets of replicate measurements for an analyte in the same reference sample were obtained by analytical procedures.    Set 1 15.4, 15.9, 16.7, 16.1, 16.2 ppm    Set 2 15.3, 17.1, 16.7, 15.5, 17.3 ppm    If the accepted content of the reference material is 15.8 ppm, compare the performance of the two procedures with regard to precision and accuracy.​    Which of the following is correct?(   )​    a. the precisions do not differ at this level.​    b. in both cases the difference between the experimental and accepted values is at less than 80% confidence.​
选项：
A: a对b错
B: a对b对
C: a错b对
D: a错b错
答案: 【 a对b对】

3、判断题：
‍Precision: Even when measurements are carried out under closely standardized conditions, some variability amongst replicate measurements will occur. This variability, which can derive from many sources is called the precision of the measurement.‏
选项：
A: 正确
B: 错误
答案: 【 正确】

4、判断题：
​Accuracy: The closeness of an experimental result to the true result is known as its accuracy, which is defined in terms of error and similarly can only be estimated.‎
选项：
A: 正确
B: 错误
答案: 【 正确】

5、判断题：
‏The interdependence of precision and accuracy: A replicate set of data with a wide spread, may still have a mean close to the true result and thus be accurate. However, this accuracy reflect good precision. Thus data may be accurate without being precise. A highly precise set of data may have been obtained with a biased method and thus be precise but inaccurate.‏
选项：
A: 正确
B: 错误
答案: 【 错误】