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B. NaOH(aq)+HCl(aq)==NaCl(aq)+H2O(l) ¡÷H<0
C. 2H2(g)+O2(g)==2H2O(l)¡÷H<0
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(2)H2+2OH-¡ú2H2O+2e-
¢ò.(3)2CuSO4+2H2O
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