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【单选题】
化学方程式的书写必须遵循两条原则：一是以客观事实为基础，二是遵循质量守恒定律．下列化学方程式书写正确的是（ ）A.
Cu+H 2 SO 4 （稀）═CuSO 4 +H 2 ↑
B.
NaOH+HCl═NaCl+H 2 O
C.
NaOH+CO 2 ═NaCO 3 +H 2 O
D.
Mg+O 2 点燃 . MgO 2
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