多项选择题

A.2NaCN+2NaOH +2H2O+O2-2Na2CO+2NH
B.2NaCN+CO2+H,O-Na2CO3+2HCN
C.3NaCN+CO2+H,O-Na2CO3+2HCN
D.NaOH+CO-Na2CO3+H2O