METHODS After 30 minutes or 8 hours of 2.5 mHz,8.0mHz ultrasound irradiating the cochlea of guinea pigs(45 ears)for 6 hours,the SDH(succinate dehydrogenase) activity of the stria vascularis was observed.

• 方法以A型脉冲超声波诊断仪为超声发射器；分别以2.；5mHz、8