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[问答题,简答题] 对流式过热器的热力特性是什么?

用硬膜外腔阻滞方法治疗癌性疼痛,该方法属于() ["物理疗法","介入疗法","麻醉疗法","手术疗法","心理疗法"] 胃肠道手术的术前准备,下列哪项是错误的() ["术前1~2日进流食","术前12小时禁食","术前4小时禁水","必要时胃肠减压","术前3天静脉滴注抗生素"] 鼻咽癌引起头痛的原因可能是因为() ["神经血管反射性痛","三叉神经第1支的末梢在硬脑膜处受压迫","颅底骨质破坏压迫三叉神经眼支","鼻部局部炎性感染","颈部淋巴结肿大压迫颈内静脉致回流障碍而产生钝性头痛"] 吸入麻醉时新鲜气流量小于多少为低流量吸入麻醉() ["1L/min","2L/min","3L/min","4L/min","6L/min"] 肺泡壁破裂融合致含气腔隙大于多少毫米时称为肺大疱() ["3mm","5mm","10mm","20mm","30mm"] 对流式过热器的热力特性是什么?
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