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2 năm trước
Dãy nào sau đây gồm tất cả các chất là bazơ? A: KOH, NaOH, H2 SO4 B: KOH, Al(OH)3 , Cu(OH)2 . C: CaO, Ba(OH)2 , H2 SO4 . D: NaOH, HCl, Mg(OH)2 .
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