单项选择题
A.DBA_TAB_COLUMNS B.DBA_TABLESPACES C.v$process D.v$session
A.DBA_TAB_COLUMNS B.DBA_TABLESPACES C.v$locked_object D.v$session
A.DBA_TAB_COLUMNS B.DBA_TABLESPACES C.DBA_DEPENDENCIES D.DBA_SOURCE