评价B细胞功能的试验是()
A.淋巴细胞转化
B.血清中免疫球蛋白检测
C.迟发型过敏反应皮肤试验
D.移动抑制试验
E.CD3检测
参考答案:B
His ambition is _____ volleyball in the 0lympics.[ ]
A. play
B. to play
C. played
D. plays
单相可控硅要满足由导通变为截止条件,应采取的措施是()。
A.升高阳极电压
B.降低阴极电压
C.断开阳极电源
D.断开控制电路