单项选择题
The universal colour reagent of the thin-layer chromatography includes（）
A．The solution of concentrated sulphuric acid B．Molish reagents C．Potassium iodide D．Sodium nitrite E．Sodium chloride
In limited test B for arsenic,which of the following sh...
In limited test B for arsenic,which of the following should be ready according to BP(1993 edition)（）
A．Sodium hydroxide B．arsenic standard solution C．iodide chloride D．Wagner reagent E．Sand bath
Add 3 ml of hydrochloric acid and 100ml of water and sh...
Add 3 ml of hydrochloric acid and 100ml of water and shake vigorously根据上文，加入水和盐酸后应（）
A．持续振摇 B．间续振摇 C．猛烈振播 D．轻轻振摇 E．边振摇边搅拌
Epicarp with polygonal cells and a small number of coni...
Epicarp with polygonal cells and a small number of conical warty trichomes and occasional stomata．根据上文，该药品最可能是一种植物的（）
A．根茎 B．果实 C．叶 D．花 E．皮
