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【单选题】
下列关于数据库系统的正确叙述是( )。A.
数据库中只存在数据项之间的关系
B.
数据库系统中数据的一致性是指数据类型一致
C.
数据库系统减少了数据冗余
D.
数据库系统比文件系统能管理更多得数据
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举一反三
【单选题】Q：What does Louis Uchitelle mean by “the disposable American” (Line 3, Para. 5)?
A.
Those who see job stability as part of their living standard.
B.
People full of Utopian ideas resulting from affluence.
C.
People who have little say in American politics.
D.
Workers who no longer have secure jobs.
【简答题】已知 不可逆,则 。
【单选题】胶合模板板材表面应平整光滑,具有防水、耐磨、耐酸碱的保护膜,并有保温性能好、易脱模和可以两面使用等特点。板材厚度不应小于( ) mm。
A.
10
B.
12
C.
15
D.
18
【简答题】Fat and shy, Ben Saunders was the last kid in his class picked for any sports team. “Football, tennis, cricket--- anything with a round ball, I was useless,” he says now with a laugh. But back then he...
【简答题】Fat and shy, Ben Saunders was the last kid in his class picked for any sports team. “Football, tennis, cricket — anything with a round ball, I was useless,” he says now with a laugh. But back then he ...
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