‏The commonly used ELISA methods are（ ）‌ A: Indirect ELISA B: Sandwich ELISA C: Competitive ELISA D: Fluorescent labeling

Properties of X-ray include:() A: Penetrating<br/>effect: B: Fluorescent<br/>effect: C: Sensitization<br/>effect: D: Ionization<br/>effect: E: All<br/>of above

科学家首先发现大海里哪种发光物种，进而发现绿色荧光蛋白(green fluorescent protein, GFP)。（ ） A: 珊瑚 B: 鳗鱼 C: 海草 D: 水母