摘要
作为二次文献的关键词 ,虽然言简但实用 ,对于收录、检索有着重要的使用价值。选择时一定要遵循国家标准规定的原则 ,认真标引 。
Although simply, key workds of secondary literatures have the essenticial value in the procedure of inclusion and indes. When selecting the
关键词
关键词
自由词
标引方法
文献检索
it is serious for author to obey the state standard related for the exchange of information fluentdy. Key words:key words
free words
rule
