A:铝片放入NaOH溶液中:2Al + 2OH-=2AlO+ H2↑
B:碳酸钙溶于醋酸中:CaCO3 + 2H+= Ca2+ + CO2↑+ H2O
C:氯气通入NaOH稀溶液中:Cl2 + 2OH-= Cl-+ ClO-+ H2O
D:Ba(OH)2溶液与过量NaHSO4溶液混合:H++ SO+ Ba2+ +OH-= BaSO4↓+ H2O
____ ____three quilts.