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B. Fill in the blanks with the expressions given below. Change the form where necessary.down to call inbeat upwind uptrial and error at all costs1. Don’t ____ yourself __ over something that you have no control over.2. They decided to _____ a doctor because the child was not any better.3. Ultimately, he said, the issue came ______ a dispute between the two countries. 4. I always said he would ______ in jail.5. Growth is a process of ___________. You can learn as much from failure as you can from success. Maybe more.6. The bridge must be repaired within three days _________.

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A. Fill in the blanks with the words given below. Change the form where necessary.internalditchfabulousrenovateplaster amateur blunderinstinct1. The police ________ badly by arresting the wrong man. 2. The house was severely destroyed, so the couple spent thousands of dollars _________ it.3. The pilot was forced to ____ the jet plane in the Gulf because of the hijacking.4. Unlike the Satellite, it has no ______ battery, though it will accept external batteries made for the iPad. 5. The basis for training relies on the dog’s natural ______ to hunt.6. The _____ was beginning to fall from the walls.7. During each war the monopoly capitalists amassed _______ wealth.8. At college he studied English and did _______ boxing.

数据模型的三要素是()

A. 外模式、模式和内模式
B. 关系模型、层次模型、网址模型
C. 实体、属性和联系
D. 数据结构、数据操作和完整性约束

数据独立性是指()

A. 用户与数据分离
B. 用户与程序分离
C. 程序与数据分离
D. 人员与设备分离

除了关系的标题栏外,二维表中水平方向的行称为()

A. 元组
B. 分量
C. 属性
D. 关系的实例

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