When a person falls into the state of sleep, his ______.

A．eyeballs will roll about a bit

B．mind will relax more and more

C．breathing will slow for minutes

D．temperature will increase slightly

电子感应加速器是以（）方式使电子沿环形轨道加速的

A、射频能量

B、磁感应

C、不导电的电荷传送带

D、高压与交流电源频率共振