冷却浴或加热浴用的试剂可选用。()
A、优级纯
B、分析纯
C、化学纯
D、工业品
参考答案:D
In relation to private companies, explain the meaning of, and the procedure for passing, the following:
(b) a written resolution. (5 marks)
纯化皂苷类成分可以用()
A.水-醚法
B.水-醇法
C.醇-水法
D.醇-醚法
E.酸-碱沉淀法