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(中文) 65動靜皆有理
(中文) 66蘋果被氧化
(中文) 67簡易凸透鏡
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(中文) 69抓個現(xiàn)行
(中文) 70虹吸實驗
(中文) 71簡易溫度計
(中文) 72氣壓差的作用
(中文) 73彩虹風火輪
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