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Examine the command： SQL> ALTER USER skd ACCOUNT LOCK； Which two statements are true after the command is executed（）
A:The SKD user cannot log in to the database instance.
B:The objects owned by the SKD user are not accessible to any user.
C:The other users can access the objects owned by the SKD user， on which they have access.
D:The password for the SKD user expires and the user is forced to change the password at the next log in.

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出自：Oracle认证

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