送交者: yuffie 于 2006-2-02, 15:16:54:
回答: 应该看中国落后发达国家多少年 由 yuffie 于 2006-2-02, 14:55:14:
Significant reductions in rates of mining deaths also have been achieved over the years.
For example, the rate of coal mining deaths decreased from about .20 fatalities per 200,000 hours worked by miners (or one death per million production hours) in 1970 to about .07 fatalities in 1977 and an average of .03 fatalities for the 1995-99 period.
http://www.msha.gov/MSHAINFO/FactSheets/MSHAFCT2.HTM
所以中国现在的水平大致是美国八十年代中期，落后二十年。