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.

4（）

A．master

B．standby slave

C．parked slave

D．active slave

抑郁症患者的睡眠紊乱以下列哪种最为多见（）

A.早醒

B.入睡困难

C.醒后不易再睡

D.易醒

E.睡眠过度