食管异物最危险的并发症（） A.食管穿孔 B.食管周围脓肿 C.纵_爱下问搜题

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问题单项选择题

食管异物最危险的并发症（）

A.食管穿孔

B.食管周围脓肿

C.纵隔脓肿

D.主动脉穿孔出血

E.气管食管瘘

答案

参考答案：D

单项选择题

诊断成年女性贫血的标准为血红蛋白浓度低于

A．140g/L

B．130g/L

C．120g/L

D．110g/L

E．100g/L

选择题

—These two bikes are both beautiful. Have you decided which to buy?
—Yes, I have. I'd like the blue one the red one.

A. instead
B. instead to
C. instead of
D. instead on