燃煤电厂的主要大气污染物是二氧化碳、氮氧化物、烟尘。（）
参考答案：错
审阅和筛选应聘者简历重点察看的客观内容包括（）。
A.自我评价和表述
B.个人信息
C.教育背景
D.工作经历
E.个人成绩
Dispersion is defined as the variability around the central tendency and can be divided into absolute dispersion and relative dispersion. Which of the following is NOT described as a measure of relative dispersion（）
A. Range.
B. Sharlle ratio.
C. Coefficient of variation.
