Beijing announced on Sunday that the date for events ____ the 40th anniversary of the normalization of China-Japan relations would be “adjusted to an appropriate time”.
【简答题】取标示量为0.25g的丙磺舒10片,称其总重为7.9612g,研细后,精密称取片粉1=191.0mg,=190.0mg,各置200ml量瓶中,按药典规定用含盐酸的乙醇稀释至刻度。滤过,精密量取续滤液5 m l,置l00ml量瓶中,加含盐酸的乙醇稀释至刻度。照紫外-可见分光光度法,在249nm的波长处测得吸光度分别为=0.498,=0.495。 按C13H19NO4S 的吸收系数()为338计算,求...