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问题 单项选择题

女婴，3天，生后呼吸困难，面色发绀，呕吐。左胸饱满，可闻肠鸣音，呼吸音减弱，叩诊鼓音，腹平软。以下病例最可能的诊断是

A．先天性肺大疱

B．先天性后外侧膈疝

C．食管旁疝

D．脓胸

E．支气管肺炎

答案

参考答案：B

问答题 简答题

间比法与对比法有什么不同？
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单项选择题

Areas which cannot be scanned by the radar of the vessel because they are shielded by parts of its superstructure, masts,etc means（）.

A.blind sectors

B.sheltered area

C.unseen area

D.unscan ble area
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