慢性再生障碍性贫血治疗应首选铁剂.
参考答案:错
解析:
慢性再生障碍性贫血治疗应首选雄激素药物。
He ______________ two tickets for us before he arrived at the entrance of the cinema.
A.had reserved
B.has reserved
C.was reserving
D.has been reserving
"髓海"指的是()
A.骨
B.胆
C.髓
D.脑
E.女子胞