下列括号中的物质是除去杂质所需的药品,其中错误是请选择DCBA+g5z3c8y/V*i(w(W3X9}4K*t7c7Z+V
A. NaCl中有杂质Na2SO4(氯化钡)8y/V*i(w(W3X9}4K*t7c7Z+V
B. FeSO4中有杂质CuSO4 (铁粉)8y/V*i(w(W3X9}4K*t7c7Z+V
C. CO2中有少量CO(灼热的氧化铜)8y/V*i(w(W3X9}4K*t7c7Z+V
D. SO2中有少量HCl气体(氢氧化钠溶液)8y/V*i(w(W3X9}4K*t7c7Z+V