单项选择题

化学发光与荧光的区别是
A 化学发光时间长，荧光的发光时间短
B 形成激发态分子的激发能不同
C 化学发光需要酶进行催化，而荧光不需要
D 化学发光和荧光的波长不同
E 荧光物质能直接标记抗原或抗体，而化学发光剂不能

你可能感兴趣的试题

单项选择题

以下哪个不属于产品生命周期所处的阶段___________。
A、投入期
B、等待期
C、成长期
D、成熟期

单项选择题

What did James and his brother usually do on Christmas day?

A．They would love to have cakes.
B．They prefered to visit friends and have big dinner together with them.
C．They usually wake up early and run downstairs to find presents under the tree.