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【单选题】
检索文献数据库时,下列哪种方法不能扩大检索范围A.
主题词加权
B.
用OR
C.
用主题词扩展
D.
采用截词符
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
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B.
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C.
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D.
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A.
Blue
B.
Blue & Black & White
C.
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D.
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