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（）

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