民航机场国际乘机手续及中转售票业务部门两字代码为（）。
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在配置500ml的维持溶液时，应加入10%氯化钾溶液的量是（）。
A. 2.5ml
B. 5ml
C. 7.5ml
D. 10ml
E. 25ml
Examine the command： ALTER DATABASE ADD SUPPLEMENTAL LOG DATA （PRIMARY KEY） COLUMNS； What does the command accomplish？（）
A. Creates an additional copy of the database online redo log files.
B. Stores the primary key column values of each row involved in a DML operation in the online redo log files.
C. Stores the primary key column values of each row involved in a DML operation in the supplemental log files.
D. Stores the old and new primary key column values of each row involved in a DML operation only when the primary key is modified in the online redo log files.
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