当前已进入信息时代,其特征之一就是科技文献资料数量激增,即所谓“信息爆炸”(Information explosion)。据我国出版局统计,有期刊登记证的国内期刊,解放初期257种,发行量每年2千万册,1977年达到628种,发行量5.59亿册,1985年达4705种,发行量25亿册。全世界生物医学期刊达3万种左右(医学期 At present, one of the characteristics of the information age has been the explosion of the volume of scientific literature, the so-called “Information explosion.” According to the statistics of China’s Publishing Bureau, there are 257 domestic journals with periodical registration certificates issued in the early days of liberation with 20 million copies circulation each year, reaching 628 kinds in 1977, with 559 million copies in circulation, 4705 in 1985 and 2.5 billion copies in circulation . The world biomedical journals up to 30,000 kinds (medical period