单项选择题
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
The cork readily exfoliates from the lateral surfaces b...
The cork readily exfoliates from the lateral surfaces but persist．s between the branches．What part of the cork is unlikely to exfoliate（）
A．上表层 B．下表层 C．两分枝中间 D．分枝的表层 E．两边表层
