根据MCV、RDW的贫血形态学分类，缺铁性贫血属于（） A.小细胞均一性贫血 B.小

治疗腹股沟疝最常用的方法是（）。

A.疝成形术

B.疝囊高位结扎术

C.疝修补术

D.手法复法

E.疝环填补术

治疗痢疾表邪未解而里热已盛者，应首选（）

A.藿香正气散

B.人参败毒散

C.葛根芩连汤

D.芍药汤

E.白头翁汤

Karl Marx _____ his English study in his fifties, and translated several English books while he was still in prison. [ ]

A. took up

B. took in

C. took off

D. took on

痢疾杆菌最常侵犯的部位是（）

A.升结肠

B.直肠和乙状结肠

C.横结肠

D.升结肠和横结肠

E.小肠

柱塞不但具有光滑耐磨的表面，并且硬度要高，硬度应达到HRC（）以上。

A、50

B、55

C、60

D、65