多项选择题
Forsolution(1)heat toboiling 0.5g powderwith 5 mlofethanol,cool andcen trifuge,decant me supernatant liquid immediately and use within 30 minutes.What procedures are employed in the above experiment()
A.取用0.58粉末 B.粉末在5mL乙醇中加热 C.冷却 D.离心 E.离心后立即取出上清液并于30分钟内使用
多项选择题 Which of the following are used for the thin--layer chromatographic stationary phaes()
多项选择题 形容词用如意动的句子是
多项选择题 引起中药发生质变的内因是