【单选题】搭便车通常多被看作是公共物品,是指
C.
有些人能够以低于正常成本的价格使用公共交通工具 .
D.
由于公共物品的供给大于需求,从而把价格压低,直到实际上免费供应为止
【单选题】有一个事务在session a被执行,begin;update tab_a set x = 1 where y = 3 ;update tab_a set x = 2 where y = 2 ;update tab_a set x = 3 where y = 3 ;commit;下面关于这个事务的描述正确的是:
A.
事务的原子性决定了这三个dml语句要么都完成,要么一个都不做.
B.
事务的持久化属性决定了事务中每一句update完成后都将被刷新到磁盘上永远不会丢失.
C.
事务的一致性决定了这三个dml是在同一时刻执行的.
D.
事务的隔离性决定了其他session在这个事务执行过程中看不到tab_a表中上y = 3的记录x = 1的状态.
【单选题】下面哪一种状态是紊流( ) A 、ReRe 临界 ,,
【单选题】搭便车通常多被看作是公共物品,是指
C.
有些人能够以低于正常成本的价格使用公共交通工具
D.
由于公共物品的供给大于需求,从而把价格压低,直到实际上免费供应为止
【单选题】A ccording to Krom, the Egypt's Old Kingdom fell.
A.
immediately after a period of drought.
B.
immediately after a period of flood.
C.
just before a drought struck.
D.
just before a flood struck.
【单选题】根据下列文章,请回答 41~45 题。 High Stress May Damage Memory A ccording to a report issued in May 1998,elderly people who have consistency high blood levels of cortisol(皮质醇)don’t score as well on memory tests as...
【单选题】搭便车通常多被看作是公共物品,是指()
B.
有些人能够以低于正常成本的价格使用公共交通工具
D.
由于公共物品的供给大予需求,从而把价格压低,直到实际上免费供应为止
【单选题】搭便车通常多被看作是公共物品,是指
B.
有些人能够以低于正常成本的价格使用公共交通工具
D.
由于公共物品的供给大于需求,从而把价格压低,直到实际上免费供应为止
【单选题】Which of the following is true a ccording to the passage?
A.
There are 1 million millionaires in the world today.
B.
A millionaires house shouldn't be counted with his financial assets.
C.
Most millionaires inherited their wealth from their parents.
【简答题】Try to describe the features of Charles Dickens' works ccording to " Great Expectations" .