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报道时差的大小是衡量检索刊物及时性的重要指标。作者对《情报科学文摘》 １９８７－１９８９年所报道的国内文献进行了调查，并对调查结果进行了分析和讨论。
The size of the reported time difference is an important indicator to measure the timeliness of searching for publications. The author investigated the domestic literatures reported in “Science Digest of Information Science” from 1987 to 1989, and analyzed and discussed the findings.