短語詞組短語Ripple current frequency characteristics 紋波電流的頻率特性ripple e frequency 脈動頻率fundamental ripple frequency 脈動基頻fundamental formula ripple frequency 波紋基頻slot ripple frequency 槽脈動頻率frequency ripple 紋波頻率low -frequency ripple 低頻紋波high -frequency ripple 高頻紋波audio frequency ripple 音頻脈動 返回 ripple frequency