粒密度表示()
A. 微粒中孔隙和微粒间的空隙所占的容积与微粉容积之比
B. 单位容积微粉的质量
C. 除去微粒本身的孔隙及粒子间的空隙占有的容积后得到的密度
D. 除去粒子间的空隙,但不排除粒子本身的细小孔隙,测定其容积而求得的密度
E. 单位重量的粉体所具有的总表面积
1. Television now plays an increasingly important role in people’s lives.2. No one will deny that we have benefited a lot from the invention of television.3. However, people have different opinions about television and have argued heatedly about its advantages and disadvantages.
冰片、樟脑、薄荷脑等药物粉碎应采用的方法为()
A. 串料
B. 串油
C. 单独粉碎
D. 水飞
E. 加液研磨
工业80目筛相当于()
A. 一号筛
B. 五号筛
C. 六号筛
D. 三号筛
E. 九号筛