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【单选题】
设置参照完整性的目的是( )A.
定义表的临时关联
B.
定义表的永久关联
C.
定义表的外部连接
D.
在插入、删除、更新记录时，确保已定义的表间关系
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反馈参考答案：
举一反三
【单选题】He knows several languages, ______, he knows English and Japanese.
A.
such as
B.
for example
C.
that is
D.
for an example
【单选题】It is not a question of how much a man knows, but what use he ______ what he knows.
A.
makes for
B.
makes of
C.
makes up
D.
makes out
【单选题】He should ( ) what he's good at, and no switch to something he knows nothing about.
A.
take on
B.
stick to
C.
go after
D.
live on
【单选题】Child as he is, he knows a lot. 同意句是
A.
Although he is a child, he knows a lot.
B.
He knows a lot because he is a child.
C.
When he is a child, he knows a lot.
【单选题】_______, he knows a lot about computer.
A.
As he is a child
B.
Child as is he
C.
Child as he is
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