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香豆素类化合物在紫外光下多显示______色荧光

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萃取法是利用混合物中各成分在两种 溶剂中____________ 的不同而达到分离的方法。

萘醌化合物从结构上考虑可以有α(1,4)、β(1,2)及amphi(2,6)三种类型,但迄今为止从天然界得到的几乎均为___________。

A really important product such as iPhone changes everything, so many consumers camp out to buy it firstly.

iPad witnessed the booming of tablet computer industry, which also made Apple the NO.1 company.

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