多选题Which two operations can be flashed back using the Flashback technology？（）ADROP USER SMITH；BDROP TABLE EMPLOYEES；CDROP TABLESPACE USERS；DALTER TABLE SALES_REP DROP PARTITION P1；EALTER TABLE EMPLOYEES DROP COLUMN DESIG_ID；
多选题
Which two operations can be flashed back using the Flashback technology？（）
A
DROP USER SMITH；
B
DROP TABLE EMPLOYEES；
C
DROP TABLESPACE USERS；
D
ALTER TABLE SALES_REP DROP PARTITION P1；
E
ALTER TABLE EMPLOYEES DROP COLUMN DESIG_ID；
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