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in zzan •  5 years ago 

伤风 😵😩😷

3 ways to calibrate ORP meter

  1. Quinhydrone
  2. Ferrous cyanide + Ferric cyanide
  3. pH buffer (- 59.1 mV for each pH unit below pH 7)

预测

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5 years ago by

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      ·  5 years ago 

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        ·  5 years ago 

      !shop

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          ·  5 years ago 

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