皮皮学，免费搜题
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搜题
【单选题】
中国知网平台提供的知识元检索功能不包括( )。A.
工具书
B.
统计数据
C.
论文
D.
指数
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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C.
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A.
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B.
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C.
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