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【多选题】
有关主题法的说法正确的有( )A.
直接以代表事物名称或概念的术语作为表达文献主题内容的标识符号，文献检索工具的一种方法。
B.
依据这些标识符号的字顺，组织和编排
C.
是制作文献检索工具的一种方法
D.
将表示各种知识领域的类目按知识分类原理进行系统排列，并以代表类目的分类号作为文献概念标识的一类情报检索语言
拍照语音搜题，微信中搜索"皮皮学"使用
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