2014 Beijing Question 2 Free-response Differentiating 2014_北京 Paper 2.(6 分)下列金属中,表面自然形成的氧化层能保护内层金属不被空气氧化的是( ) A. KB. NaC. FeD. Al Answer keyD ☆ SaveCan't do it, show the explanation查看原卷 →