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    3.下列化學物質在實際生產、生活和科技等方面的敘述正確的是(  )

    A. 二氧化硅是太陽能電池的主要材料

    B. SO2、漂白粉、活性炭、Na2O2都能使品紅溶液褪色,其原理相同

    C. 在食品袋中放入裝有硅膠、鐵粉的透氣小袋,可防止食物受潮、氧化變質

    D. 某雨水樣品放置一段時間后,酸性增強,是因為溶解了CO2

    【答案】C

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