下列同学对化学式“h2o2 的认识中正确的是 A.h2o2是氧化物 B.h2o2中氢元素和氧元素的质量比为11c.h2o2由氢气和氧气 Template




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tomski下列同学对化学式“h2o2 的认识中正确的是 a.h2o2是氧化物 coloring