I am afraid that Mrs. Black doesn’t believe her son is able to design such a complicated machine,       ?

A．does she

B．aren’t I

C．is he

D．isn’t he

再生障碍性贫血与阵发性睡眠性血红蛋白尿以下哪项可资鉴别()

A．全血细胞计数

B．血小板计数

C．白细胞计数

D．HB测定

E．Ham试验