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学科门下设一级学科，一级学科是学科大类，用四位码表示。
Course door sets one degree course, one degree course is kinds course is old, with 4 the code expresses.
youdao
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学科门下设一级学科，一级学科是学科大类，用四位码表示。
Course door sets one degree course, one degree course is kinds course is old, with 4 the code expresses.
youdao