【題目】鐵生銹的條件是_____________并存，鐵銹的主要成分是_________，鐵銹是一種混合物，鐵生就后變得疏松多孔，因而不能阻止鐵繼續(xù)被銹蝕，破壞鐵生銹的條件就能防止鐵生銹。

【答案】水和空氣；氧化鐵

【解析】鐵生銹是鐵在空氣中與氧氣和水發(fā)生的緩慢氧化的過(guò)程，該變化需要氧氣和水同時(shí)存在，缺一不可；鐵銹是一種混合物，其主要成分是氧化鐵。

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