单选题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；
题目
单选题
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；