关于抗体的功能，错误的有
A．中和毒素B．通过胎盘C．结合抗原D．杀伤靶细胞E．激活补体
参考答案：D
Mr. Smith stood up in defence of the 16-year-old boy, saying that he was not the person ____.
A．blamed
B．blaming
C．to be blamed
D．to blame
在图中，电压表的示数是_________V
