肾性贫血的主要原因是（）。A.叶酸缺乏 B.铁缺乏 C.失血过多 _爱下问搜题

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问题单项选择题 A1型题

肾性贫血的主要原因是（）。

A.叶酸缺乏

B.铁缺乏

C.失血过多

D.红细胞生成素减少

E.饮食减少

答案

参考答案：D

选择题

— This returned scientist has become one of the top experts in his field.
— Yes, I know him very well. He once _____ in South America with wild animals for eight years.

A. has worked
B. worked
C. had worked
D. has been working

单项选择题

装有SF6设备的配电装置室和SF6气体实验室，应装设强力通风装置，风口应设置在（），排风口不应朝向居民住宅或行人。

A.室内底部；

B.室内上部；

C.室外；

D.室内中部