Mr Lessings suggests that Mr Williams go to a karaoke bar so that he can sing along to his favourite _____.
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Shanghai Museum is open until _________ that afternoon.
A. 6 o'clock
B. 5 o'clock
Mr Williams plans to do some shopping and bring some _______ home for his family.
A. presents
B. souvenirs
They will take ________ to the museum.
A. a taxi
B. the underground
事务的隔离性是指()。
A)一个事务内部的操作及使用的数据对并发的其 他事务是隔离的
B)事务一旦提交,对数据 库的改变是永久的
C. )事务中包括的所有操作 要么都做,要么都不做 事务必须是使数据库从
D)一个一致性状态变到另 一个一致性状态
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