Rose is too young to go to school. [ ]

A. old enough to go to school

B. too short to go home

C. so young that she can't go to school

D. a school girl

微粒子化学发光免疫采用

A．采用化学发光剂作为酶反应底物
B．用化学发光剂直接标记抗原或抗体
C．抗体包被在磁颗粒表面
D．发光底物是二价的三联吡啶钌
E．以荧光物质标记抗体