A Bluetooth device can be either a master or a slave and any of the devices　within a ?。?）　 can be the master. There is only one master and there can be up to ?。?）　 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 ?。?）　 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 ?。?）　 communications are prohibited.
（1）A．Wireless LAN
B．Wireless MAN
C．Cellular radio network
D．Piconet
（2）A．7
B．15
C．63
D．255
（3）A．127
B．255
C．511
D．1023
（4）A．master
B．standby slave
C．parked slave
D．a(chǎn)ctive slave
（5）A．master-to-master
B．master-to-slave
C．slave-to-slave
D．slave-to-master