PSA中KV5-3实际关不上时有什么现象和后果？怎么处理？
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用HPLC法测得某药保留时间为12.54min，半高峰宽3.0mm（纸速5mm/min），计算柱效（）。
A. 116
B. 484
C. 2408
D. 2904
E. 2420
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.
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
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