Unverified85% confidenceDecision RuleTime unknown
综合类文献检索优先选Web of Science或Scopus做发现层，再用学科库(如PubMed/IEEE Xplore)做深挖，单一数据库覆盖率通常不足总相关文献的60%
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85%
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Long-term
Relevance
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UnverifiedScopus收录期刊约2.7万种、覆盖学科广于Web of Science核心合集；WoS核心合集以SCI/SSCI精选期刊为主，收录门槛更严69% similarUnverified工程与计算机领域，IEEE Xplore和ACM Digital Library对会议论文(顶会)的全文覆盖远超综合库，CS领域顶会论文重要性高于期刊，别只订期刊型数据库67% similarUnverified做系统综述（Systematic Review）时不能只依赖单一引擎，PRISMA 规范要求至少检索 2-3 个数据库（如 PubMed + Embase + Cochrane），因为各库收录期刊有 30%-40% 不重叠64% similarUnverifiedScopus由Elsevier维护，收录了约27,000种期刊和会议；Web of Science由Clarivate维护，质量筛选更严格61% similarUnverifiedExa语义搜索引擎的索引层针对结构化知识内容（论文、技术文档、代码库）做了专项优化61% similar
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