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某课外活动小组的同学为了研究金属腐蚀的条件，进行了如下探究活动： 请根据以上实验及现象回答下列问题： (1)该实验的结论是：铁生锈是铁与_________、_________等物质共同作用的结果； (2)若在实验装置C的蒸馏水中加入少量食盐，铁片锈蚀的速率将_________ (填“变大”、“不变”或“变小”)； (3)A中要保持试管内空气干燥，可加入_________ (填化学式)来吸收水份； (4)实验启示：结合实验B，列举一种防止铁制品生锈的具体方法：______________________________________________________________________________________。
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