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【单选题】
牙膜中上皮剩余的组织学来源于
A.
牙板上皮
B.
口腔上皮
C.
成釉器上皮
D.
上鞘上皮
E.
缩余釉上皮
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举一反三
【单选题】We all associate colors with feelings and attitudes. In politics, dark blue often means 'tradition', and red means 'social change'. But blue can also mean sadness (I'm feeling blue). White is often fo...
A.
the association of day and night with passivity and action in ancient time
B.
the association of black with funerals in western Europe
C.
the association of white with purity in some countries
D.
the association of red with joy in China
【单选题】数据模型的三个组成部分是数据结构、数据操作和_____。
A.
数据安全性控制
B.
数据一致性规则
C.
数据完整性约束
D.
数据处理
【简答题】结构数据模型的三个组成部分是数据结构、数据操作和____。
【单选题】通常一个数据库的数据模型是由()、数据操作和完整性约束三个部分组成的。
A.
数据结构
B.
记录结构
C.
库结构
D.
关系
【单选题】It can be inferred from the last paragraph that
A.
women are often involved in politics in Germany.
B.
in Germany, there are now some female leaders, including Merkel.
C.
Merkel becomes a chancellor because she is no longer a girl.
D.
it does need a lot to become a female chancellor in Germany.
【单选题】We all associate colors with feeling and attitudes. In politics dark blue often means 'tradition', and red means 'social change'. But blue can also mean sadness (I'm feeling blue), white is often for ...
A.
the association of day and night with passivity and action in ancient time
B.
the association of black with funerals in western Europe
C.
the association of white with purity in some countries
D.
the association of red with joy in China
【简答题】在Visual FoxPro中,相当于主关键字的索引是(    )。 A) 主索引     B) 普通索引 C) 唯一索引 D) 排序索引
【简答题】International politics is often defined as politics in theabsence of a common ______ , politics among entities with no _____ above them.
【判断题】数据模型是数据库管理系统中用于提供信息数据表示和操作手段的形式构架,数据模型通常由数据结构、数据操作和完整性约束3个部分组成,也称数据模型三要素。
A.
正确
B.
错误
【单选题】在Visual FoxPro中,相当于主关键字的索引是(    )。
A.
主索引    
B.
普通索引    
C.
唯一索引    
D.
排序索引
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