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问题 填空题

数字猜成语。

123456709（　　　　）　　1256789（　　　　）　　1+2+3（　　　　）

3333  5555（　　　　）　　3.5（　　　　）　　　　5  10（　　　　）

9寸+1寸=1尺（　　　　）

答案

七零八落　丢三落四　接二连三　三五成群　不三不四　一五一十　得寸进尺

单项选择题

A Bluetooth device can be either a master or a slave and any of the devices within a (1) can be the master. There is only one master and there can be up to (2) active slave devices at a time within a single network. In addition, a device may be a standby slave or a parked slave. There can be up to (3) parked slaves. If there are already maximum number of active slaves, then a parked slave must wait until one of the active slaves switches to (4) mode before it can become active. Within a network, all (5) communications are prohibited.

1（）

A．Wireless LAN

B．Wireless MAN

C．Cellular radio network

D．Piconet
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单项选择题

若关系模式R属于2NF，且它的每一个非主属性都不传递函数依赖于R的主键，则称R属于( )

A．3NF

B．4NF

C．5NF

D．BCNF
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