下列各组概念,具有交叉关系的是()
A.“平行四边形”与“正方形”
B.“等边三角形”与“等腰三角形”
C.“基础课”与“必修课”
D.“牛”与“用来耕地的家畜”
E.“研究生”与“留学生”
正确答案是DE
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