女，56岁，右侧中耳术后发现右外耳道新生物一年，PE：右外耳道内段被新生物充满，CT如图所示，应诊断为（）。

A.胆脂瘤

B.中耳癌

C.颈静脉球瘤

D.听神经瘤

E.中耳结核

A Bluetooth device can be either a master or a slave and any of the devices within a ___30___can be the master. There is only one master and there can be up to ___31___ 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 ___32___.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 ___33___ mode before it can become active. Within a network, all ___34___ communications are prohibited.

31（）

A.7 

B.15 

C.63 

D.255