氧治疗不具有下列哪项作用()
A.提高吸入氧浓度(FiO2)
B.提高肺泡氧分压(PaO2)
C.提高动脉氧分压(PaO2)
D.适用于防治低氧血症
E.有利于肺原发病治疗
参考答案:E
We wouldn't have called a taxi yesterday if Harold __________us a ride home.[ ]
A. didn't offer
B. wouldn't offer
C. hasn't offered
D. hadn't offered
镇痛作用效价强度最高的药物是
A.吗啡B.哌替啶C.芬太尼D.喷他佐辛E.美沙酮