吸氧时氧气流量是4L/min,其吸氧浓度为()
A.30%
B.37%
C.40%
D.42%
E.47%
参考答案:B
Who is ______ ? Is ______ your sister? [ ]
A. that; he
B. that; she
C. he; she
男性,48岁。主诉:上腹隐痛2个月,皮肤黄染1周。请针对该案例,说明问诊内容与技巧。