对于极微量(ng甚至pg水平)抗原的检测,下列选项中首先考虑使用()
A.反向间接血凝法
B.荧光抗体技术
C.放射免疫测定
D.ELISA法
E.凝集试验
参考答案:C
Hearing the dog barking fiercely, away__________. [ ]
A. fleeing the burglar
B. was fleeing the burglar
C. the burglar was fleeing
D. fled the burglar
颅内动脉瘤的最好发部位是()
A.颈内动脉系统
B.大脑前动脉
C.椎—底动脉系统
D.大脑中动脉
E.海绵窦