About ____ gene-targeting drugs are already in testing pipeline. It won’t be long ____ they are put into effect.

A．two dozen; before

B．two dozens; that

C．two dozens of; before

D．dozens; that

进行散剂混合时，其混合原则是量少、质重、色深、毒剧药作基础，然后将其他药物逐渐分次加入研磨，混匀的方法称为

A．研磨法

B．等量递增法

C．过筛法

D．打底套色法

E．搅拌法