中科新闻网深圳引进人才补贴政策:一道英文的统计题! 急用!谢谢!!
来源：百度文库 编辑：中科新闻网 时间：2024/05/08 00:53:11
The Environmental Protection Agency requires industry to report releases of any of a list of toxic chemicals. The total amounts released (in thousands of pounds) were 3,395,867 in 1988, 1,236,554 in 1995 and 1,232,783 in 1997. Give an index number of toxic chemical releases in each of these years, with 1988 as the base period. By what percent did releases increase or decrease between 1988 and 1997?