（多选题）
Your database is in NOARCHIVELOG mode. After which two operations you should take the backup of control file？（）
Aadding a new user to the database
Bdropping a user from the database
Cdropping a table from the database
Ddropping a data file from a tablespace
Eadding a new tablespace to the database
正确答案
答案解析
略
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