随着科学技术不断向深度和广度发展,科技文献数量也在急剧增加,现代科技文献的特点是:数量巨大,增长快;类型复杂多样;交叉现象普遍;文献异常分散,“时滞”加长,失效加快;这些给科技资科管理和检索利用带来 As science and technology continue to develop in depth and breadth, the number of science and technology literature is also rapidly increasing. The features of modern science and technology literature are as follows: the number is huge, the growth is rapid; the types are complex and diverse; the phenomena of crossover are common; the literature is scattered and the " Failure to accelerate; these to bring science and technology management and retrieval