returng titration的用法和樣例：
例句
- The main problems in determination of gold by the back titration for the excessive FeSO4 with potassium bichromate were discussed and experimented.
對重鉻酸鉀滴定過量硫酸亞鐵返滴定法測定金合金中金的主要問題做了探討和實驗。 - The effective composition content of poly-alcohol was measured by back titration using NaPTB complex-salt which originated from analysis method of nonionic surfactant.
本文引用非離子表面活性劑分析方法中的四苯硼鈉絡鹽返滴定法測定了聚合醇有效成分的含量。
