按下图装置进行实验玻璃管a中的�色粉末可能是纯净物或混合物 1打开活塞r若通人co2气体c处有可燃性气体燃烧则a处�色粉末是 A Template




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tomski按下图装置进行实验玻璃管a中的�色粉末可能是纯净物或混合物 1打开活塞r若通人co2气体c处有可燃性气体燃烧则a处�色粉末是 a coloring