증기 기관, 양초, 아이패드, 라디오, 석유 램프, 팩스, 인쇄기 등 전기 발명 이전에 이러한 기술이 존재했는지 말해보세요.
증기기관: 존재했을 것, 양초: 존재했을 것, 아이패드: 존재하지 않았을 것, 라디오: 존재하지 않았을 것, 석유 램프: 존재했을 것, 팩스: 존재하지 않았을 것, 인쇄기: 존재했을 것
Tell me if these technologies would have existed before the invention of electricity or not: steam engine, candles, iPad, radio, oil lamps, fax machine, printing press
steam engine: would have existed, candles: would have existed, iPad: would not have existed, radio: would not have existed, oil lamps: would have existed, fax machine: would not have existed, printing press: would have existed