当今的时代，是一个科学技术高度发展的信息时代，是一个文献信息多形式、多载体、多元化并存的时代，除印刷型文献外，还有光盘、磁盘、多媒体、音像和缩微资料以及不断出现的各种网上文献，一个不受时间、空间和经济制约而共享全球文献资源的电子信息时代已经到来。随着科技 Today’s era is an era of highly developed science and technology information. It is an era of multi-form, multi-carrier and pluralistic coexistence of documentary information. In addition to printed literature, there are also CDs, disks, multimedia, audiovisual and microfilm materials, The emergence of a variety of online literature, an era of electronic information sharing global literature resources free from time, space and economic constraints, has come. With technology