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跳跃反应的中枢位于

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女性，74岁，两年前诊断肺心病，一周来咳嗽、咳痰、喘息加重，双下肢水肿，体检：肺内大量湿啰音，心率100次/分，肝肋下2.5cm，双下肢水肿。白细胞计数及中性粒细胞分类均增高，血气分析：pH 7.335，PaO250mmHg，PaCO278mmHg，HCO3—34mmol/L，BE 4mm01/L。
该患者目前不存在下列哪种并发症

A. 肺部感染
B. 心力衰竭
C. 呼吸衰竭
D. 呼吸性酸中毒合并代谢性酸中毒

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某急性肠梗阻患者，自述口渴，乏力，尿少，皮肤弹性差，口唇干燥，眼窝内陷，诊断为E．

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心的正常起搏点是E．

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A．She has been waiting for her friend's coming.B．She has kept her friend's letter for s

A. She has been waiting for her friend's coming.
B. She has kept her friend's letter for six weeks.
C. She hasn't written to her friend for six weeks.
D. She owed her friend some money.

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