【单选题】
A Na<span baselineShift="subscript">2CO<span baselineShift="subscript">3
B NH<span baselineShift="subscript">4NO<span baselineShift="subscript">3
C Na<span baselineShift="subscript">2SO<span baselineShift="subscript">4
D KNO<span baselineShift="subscript">3
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