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A. NO3−,NO2−,HCOO−,CH3COO−\mathrm{NO}_{3}{ }^{-}, \mathrm{NO}_{2}{ }^{-}, \mathrm{HCOO}^{-}, \mathrm{CH}_{3} \mathrm{COO}^{-}NO3−,NO2−,HCOO−,CH3COO−
B. CH3COO−,HCOO−,NO2−,NO3−\mathrm{CH}_{3} \mathrm{COO}^{-}, \mathrm{HCOO}^{-}, \mathrm{NO}_{2}{ }^{-}, \mathrm{NO}_{3}{ }^{-}CH3COO−,HCOO−,NO2−,NO3−
C. NO3−,CH3COO−,HCOO−,NO2−\mathrm{NO}_{3}{ }^{-}, \mathrm{CH}_{3} \mathrm{COO}^{-}, \mathrm{HCOO}^{-}, \mathrm{NO}_{2}{ }^{-}NO3−,CH3COO−,HCOO−,NO2−
D. CH3COO−,NO3−,NO2−,HCOO−\mathrm{CH}_{3} \mathrm{COO}^{-}, \mathrm{NO}_{3}{ }^{-}, \mathrm{NO}_{2}{ }^{-}, \mathrm{HCOO}^{-}CH3COO−,NO3−,NO2−,HCOO−
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