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一家三口到火锅店吃火锅。 （1）火锅常用的燃料有木炭、天然气、酒精（固体酒精）等。天然气中的主要成分在空气中燃烧的化学方程式为_________________。 （2）他们选的菜品有：牛肉片、鱼片、白菜、胡萝卜、豆腐和新鲜鸭血等。 ①菜品中提供蛋白质较多的有________（填一种即可）等。 ②新鲜鸭血中含有多种微量元素，其中铁含量极为丰富，因此食用鸭血有预防治疗_____的功效。 （3）他们选择以固体酒精为燃料的小火锅（如下图所示）。观察火锅的结构，发现固体酒精与锅的底部之间有一定的空间，请你分析一下可能的原因有______________________。 （4）在吃火锅过程中，喜欢火锅内加一定的食醋，加入食醋能否腐蚀火锅_____，原因是_______________________________。
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