34.下列物質與水的反應式,何者正確?(A)Li+2H2O→Li(OH)2+H2(B)Mg+2H2O→Mg(OH)2+H2(C)Ca3P2+6H2O→3Ca(OH)2+2PH3(D)K2C2+2H2O→2KOH+C2H2(E)Al4C3+12H2O→4Al(OH)2+3CH4+H2