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Gaokao Chemistry Practice Question

下列物质属于强电解质的是

  1. A.$\mathrm{HCOOH}$
  2. B.$\mathrm{Fe}$
  3. C.$\mathrm{Na}_{2} \mathrm{CO}_{3}$
  4. D.$\mathrm{C}_{2} \mathrm{H}_{2}$

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