【简答题】七选五: 根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 Being scared is not always a treat. When a balloon pops, we may jump. 36 . How does the body triggered ( 激发 ) these reactions? When we encounter somethin...
【简答题】苯巴比妥片(规格30mg)的含量测定,取本品20片,精密称定为4.1324g,研细,精密称取片粉1.3825g,加甲醇40ml使苯巴比妥溶解后,再加新制的3%无水碳酸钠溶液15ml,照电位滴定法,用硝酸银滴定液(0.0988mol/L)滴定至终点,消耗硝酸银滴定液8.70ml,试计算标示量百分含量?(每1ml硝酸银滴定液(0.1mol/L)相当于23.22mg的C 12 H 12 N 2 O 5 ...