【单选题】【消耗次数：1】
检索文献数据库时，下列哪种方法不能扩大检索范围（）
①
用OR
②
主题词加权
③
用主题词扩展
④
采用截词
参考答案：
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相关题目
【单选题】
PubMed中主题词检索针对的是以下哪个数据库？（）
①
MEDLINE
②
in-process citations
③
publisher-supplied citations
④
OLDMEDLINE
【单选题】
下列与PubMed主题词检索无关的是（）？
①
Mesh Major Topic[MAJR]
②
Mesh Subheadings[SH]
③
Subset[SB]
④
Mesh Terms[MH]
【单选题】
下列有关主题词检索需注意的问题，不正确的是（ ）
①
当含有多个主题词时，在MeSH Database中的操作往往需要重复多次
②
同时选多个副主题词时，其间的逻辑关系是AND
③
系统默认对下位主题词进行扩检，若不需要，可勾选
④
进入页面需观察是否有更加合适的主题词
⑤
进入到主题词细节页面时，要多注意主题词的上位词和下位词情况
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