主要的检索途径有哪几种类型?
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![主要的检索途径有哪几种类型?](/uploads/image/z/11480970-66-0.jpg?t=%E4%B8%BB%E8%A6%81%E7%9A%84%E6%A3%80%E7%B4%A2%E9%80%94%E5%BE%84%E6%9C%89%E5%93%AA%E5%87%A0%E7%A7%8D%E7%B1%BB%E5%9E%8B%3F)
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