A Bluetooth device can be either a master or a slave and any of the devices within a （71） can be the master．There is only one master and there can be up to （72） 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 （73） 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 （74） mode before it can become active．Within a network, all （75） communications are prohibited.

空白处（75）应选择（）

A．master-to-master

B．master-to-slave

C．slave-to-slave

D．slave-to-master

线路运行巡视指导书“110kV枫白12050线2#塔至14#塔巡视工作”适用于（）工作。

A.110kV枫白1205线附近线路巡视检查工作

B.110kV枫白12050线2#塔至14#塔巡视

C.110kV枫白12050线2所有塔巡视

D.110kV白云变电站所内电缆巡视检查