设有课程关系Course(课程号,课程名,学分,开设专业号,先修课程号)和专业关系Speciality(专业号,专业名),则课程关系Course的外键是
A.课程号
B.开设专业号
C.先修课程号
D.开设专业号和先修课程号
正确答案是D
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