题目内容

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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A．She's glad the man waited for her.B．She'd like to reschedule the meeting.C．She wasn'

A. She's glad the man waited for her.
B. She'd like to reschedule the meeting.
C. She wasn't very late for the meeting.
D. She's sorry that she missed the meeting.

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A．程序、数据和标示符B．程序、数据和PCBC．程序、标示符和PCBD．数据、标示符和PCB

A. 程序、数据和标示符
B. 程序、数据和PCB
C. 程序、标示符和PCB
D. 数据、标示符和PCB

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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

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．She's glad the man waited for her.B．She'd like to reschedule the meeting.C．She wasn'

A．程序、数据和标示符B．程序、数据和PCBC．程序、标示符和PCBD．数据、标示符和PCB

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)