高等教育 / 数据库原理及应用(管理类)
已知关系R如图1所示，可以作为R主码的属性组是（）
style='font-family:宋体'>A
style='font-family:宋体'>B
style='font-family:宋体'>C
style='font-family:宋体'>D
style='font-family:宋体'>1
style='font-family:宋体'>2
style='font-family:宋体'>3
style='font-family:宋体'>4
style='font-family:宋体'>1
style='font-family:宋体'>3
style='font-family:宋体'>4
style='font-family:宋体'>5
style='font-family:宋体'>2
style='font-family:宋体'>4
style='font-family:宋体'>5
style='font-family:宋体'>6
style='font-family:宋体'>1
style='font-family:宋体'>4
style='font-family:宋体'>3
style='font-family:宋体'>4
style='font-family:宋体'>1
style='font-family:宋体'>3
style='font-family:宋体'>4
style='font-family:宋体'>7
style='font-family:宋体'>3
style='font-family:宋体'>4
style='font-family:宋体'>5
style='font-family:宋体'>6
A、ABC
B、ABD
C、ACD
D、BCD
style='font-family:宋体'>A
style='font-family:宋体'>B
style='font-family:宋体'>C
style='font-family:宋体'>D
style='font-family:宋体'>1
style='font-family:宋体'>2
style='font-family:宋体'>3
style='font-family:宋体'>4
style='font-family:宋体'>1
style='font-family:宋体'>3
style='font-family:宋体'>4
style='font-family:宋体'>5
style='font-family:宋体'>2
style='font-family:宋体'>4
style='font-family:宋体'>5
style='font-family:宋体'>6
style='font-family:宋体'>1
style='font-family:宋体'>4
style='font-family:宋体'>3
style='font-family:宋体'>4
style='font-family:宋体'>1
style='font-family:宋体'>3
style='font-family:宋体'>4
style='font-family:宋体'>7
style='font-family:宋体'>3
style='font-family:宋体'>4
style='font-family:宋体'>5
style='font-family:宋体'>6
A、ABC
B、ABD
C、ACD
D、BCD
参考答案：
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