The main changes in the three commonly used CD ROM retrieval systems are introduced,including the enhancement of the window functions,the change of the field index function in SP software and the new saving and reusin...The main changes in the three commonly used CD ROM retrieval systems are introduced,including the enhancement of the window functions,the change of the field index function in SP software and the new saving and reusing functions of ProQuest for its retrieval strategies.展开更多
文摘The main changes in the three commonly used CD ROM retrieval systems are introduced,including the enhancement of the window functions,the change of the field index function in SP software and the new saving and reusing functions of ProQuest for its retrieval strategies.