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        世界腐蝕日

        Exhibition 科普展板

        Experiments 科普實驗

        銅鋅原電池實驗
        金屬的吸氧腐蝕
        鐵和鎂的電偶腐蝕
        電解池中的五彩繽紛
        水果電池

        Paintings Exhibition 科普繪畫展覽

        国产在线视频一区二区_亚洲黄色视频网站_精品人妻一区二区三区四_天天天天躁天天爱天天碰2018

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