单项选择题
The physico-chemieal characteristics of rutinis（）
A．gradual reddening on exposure to light B．Soluble in cold water C．Completely soluble in alcohol,acetone D．easily soluble in chloroform E．soluble in alkaline solutions
The universal colour reagent of the thin-layer chromato...
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
