对于理想的平推流和全混流模型而言,反应器中均不存在返混。
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Unit 4 text BIn Battle Hymn of the Tiger Mother, Amy Chua describes her determination to make her two daughters successful by raising them in a strict 1.___.A lot of people wonder how Chinese parents raise such 2.___ successful kids.I recently met a super successful white guy from South Dakota (you’ve seen him on television), and after comparing 3.___ we decided that his working-class father had definitely been a Chinese mother.In fact, I’ll go out on a limb and say that Westerners are far more 4.___ in their parenting styles than the Chinese.In one study of 50 Western American mothers and 48 Chinese immigrant mothers, almost 70% of the Western mothers said either that “stressing academic success is not good for children” or that “parents need to 5.___ the idea that learning is fun.” By contrast, 6.___0% of the Chinese mothers felt the same way. The vast majority of the Chinese mothers said that "academic achievement 7.___ successful parenting” and that if children did not excel at school then there was “a problem” and parents “were not doing their job".Other studies 8.___ that compared to Western parents, Chinese parents spend approximately ten times as long every day 9.___academic activities with their children. Unlike your typical Western 10.___soccer mom, the Chinese mother believes that (1) schoolwork always comes first; (2) an A-minus is a bad grade; (3) your children must be two years ahead of their classmates in math......
用于提交事务的语句是( )。
A. insert
B. rollback
C. commit
D. grant
下面( )是MySQL的默认事务隔离级别。
A.read uncommitted
B.read committed
C.repeatable read
D.serializable
若事务T对数据R已经加S锁,则其他事务对数据R( )。
A. 可以加S锁,不能加X锁
B. 不能加S锁,可以加X锁
C. 可以加S锁,也可以加X锁
D. 不能加任何锁