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【单选题】
在关系数据库设计中,逻辑数据库设计阶段完成的是__________的任务。A.
收集需求和整理理解需求
B.
用“Create Table”创建表及其索引
C.
创建E-R图/
D.
关系模式设计，建立逻辑模型
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【单选题】Many animals have an excellent sense of smell, which they use in hunting. On the other hand, their eyesight may be poor. Dogs, for example, have poor eyesight and no color vision. They see only shades...
A.
Many animals have poor eyesight while their sense of smell, is quite good.
B.
Dogs are color blind.
C.
The human sense of smell is not good.
D.
Dogs can see no more than shades of gray.
【简答题】How Barack Obama Became the First African American President of the US: The Untold Story Barack Obama was sworn in as the 44th President of the United States of America. This is a remarkable accomplis...
【单选题】下列关于类型转换的描述中错误的是
A.
同类型操作数组成的表达式中，表达式类型一定是最高类型double型
B.
表达式的类型是最后一个子表达式的类型
C.
表达式的类型是左值的类型
D.
低向高的类型转换中是保值映射
【简答题】在影响行业生命周期的技术进步因素中，最重要也是首先需要考虑的是（ ）。
【单选题】根据以下资料，回答9~12题。 Many animals have an excellent sense of smell, which they use in hunting．On the other hand, their eyesight may be poor．Dogs, for example, have poor eyesight and no color vision．They se...
A.
Many animals have poor eyesight while their sense of smell, is quite good．
B.
Dogs are color blind.
C.
The human sense of smell is not good.
D.
Dogs can see no more than shades of gray.
【简答题】在影响行业生命周期的技术进步因素中，最重要也是首先需要考虑的是（ ）。
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