88. Data files of which three tablespaces can be recovered by performing an open recovery? (Choose three.)
A) TEMP
B) UNDO
C) INDEX
D) SYSAUX
E) SYSTEM
答案是A、C、D
问下，这个题目意思是啥？我看不太懂！
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哪三个表空间的数据文件能通过（open recovery)方法来恢复？
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