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据美国化学文摘资料来源索引(Chenmical Abstracts Service Source Index)的统计资料,从1986年到1991年(各年度按从上年7月至本年6月统计,如1986年是指1985年7月至1986年6月),6年中我国
According to the statistics of the Chemical Abstracts Service Source Index from 1986 to 1991 (the statistics for each year from July to June this year are as follows: 1986 refers to the period from July 1985 to 1986 June), 6 years in China