称取1.032g氧化铝试样,溶解定250mL容量瓶中,移取25.00mL,加入TAl2O3/EDTA=1.505mg/mL的EDTA溶液10.00mL,以二甲酚橙为指示剂,用Zn(Ac)2标准滴定溶液12.20mL滴定至终点,已知20.00mLZn(Ac)2溶液相当于13.62 ML EDTA溶液。则试样中Al2O3的含量为().
【简答题】Task2Complete the following sentences with the words or phrases given below. Change the form if necessary.knowledge imply pay intelt conduct entertain formal ...
【简答题】Task 2 Complete the following sentences with the words from Task 1. Change the form if necessary. Cable television companies have launched major campaigns to increase their number of _______________...