妊娠时母体内甲状旁腺素和甲状腺素会增高。()
参考答案:对
---Good evening. I _______ to see Miss Lisa.
---Oh, good evening. I’m sorry, but she is not in.
A.have come
B.come
C.came
D.had come
关于再生障碍性贫血发病机制的叙述,错误的是()
A.造血干细胞受损
B.造血微环境缺陷
C.成熟血细胞结构异常
D.细胞免疫机制异常
E.体液调节异常