Which two statements are correct regarding the Flashback Versions Query feature?()
A. You can use this feature to identify the committed versions of the rows, but not the uncommitted versions.
B. You can use this feature to identify the versions of V$ views.
C. You can use this feature to identify the inserts, deletes, and updates performed on a particular row but not the data definition language (DDL) operations performed on the table.
D. You can use this feature for a table only if row movement is enabled for the table.
E. You can use this feature to identify the versions of external and fixed tables.
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证券公司申请介绍业务资格,申请日前()个月各项风险控制指标符合规定标准。
A. 3
B. 6
C. 9
D. 12
非处方药分为甲类、乙类的依据是:()
A. 药品价格
B. 药品安全性
C. 药品规格
D. 药品的经营方式
乙烯制冷压缩机停车后,乙烯精馏塔全回流操作。
A. 正确
B. 错误