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zzcanteamzz2k19
2 năm trước
1)Tỉ lệ về thể tích giữa O2 và không khí gần bằng: a/1:5. b/5:1. c/4:1. d/1:4 2/ cho nhóm chất sau C,P,CH4,Fe,CO2,ZnO nhóm chất đều tác dụng với oxi là: a/C, Cu, ZnO b/P, Fe, CO2, S c/C, P, CH4, Fe d/C, Mg, CO2, ZnO
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