为了解决等效因子的不稳定性，提出了一种两步标定法。
To solve the instability of the equivalent factor, a novel two-step calibration method is proposed.
由于标准亚锡溶液不稳定，提出了用高锰酸钾滴定法标定标准亚锡溶液。
Known as the unstability of the stannous solution, potassium permanganate process was used to standardized it.
由于标准亚锡溶液不稳定，提出了用高锰酸钾滴定法标定标准亚锡溶液。
Known as the unstability of the stannous solution, potassium permanganate process was used to standardized it.
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