题目内容

Attribute-based shopping goods are more expensive than price-based goods.

A. Right
B. Wrong
C. Not mentioned

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In 1845 Sarah Mather invented a submarine telescope that could be used to locate and study

A. illuminate
B. raise
C. find
D. examine

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Before making the final decision of whether or not to buy shopping goods, a customer has to visit various shops to gather information.

A. Right
B. Wrong
C. Not mentioned

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关系模式R(U，F)，其中U={A，B，C，D，E}，F={AC→E，E→D，A→B，B→D}。关系模式R的候选键是(45)，(46)是无损连接并保持函数依赖的分解。
(56)

AC
B. ED
C. AB
D. ABC

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A．She hasn't spoken to her friend in a long time.B．She intends to visit her friend in T

A. She hasn't spoken to her friend in a long time.
B. She intends to visit her friend in Texas.
C. She sometimes travels abroad for her job.
D. Her friend has never been to Texas before.

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Attribute-based shopping goods are more expensive than price-based goods.

A. Right B. Wrong C. Not mentioned

In 1845 Sarah Mather invented a submarine telescope that could be used to locate and study

Before making the final decision of whether or not to buy shopping goods, a customer has to visit various shops to gather information.

关系模式R(U，F)，其中U={A，B，C，D，E}，F={AC→E，E→D，A→B，B→D}。关系模式R的候选键是(45)，(46)是无损连接并保持函数依赖的分解。(56)

A．She hasn't spoken to her friend in a long time.B．She intends to visit her friend in T

A. Right
B. Wrong
C. Not mentioned

关系模式R(U，F)，其中U={A，B，C，D，E}，F={AC→E，E→D，A→B，B→D}。关系模式R的候选键是(45)，(46)是无损连接并保持函数依赖的分解。
(56)