第25题: [单项选择]心室扑动心电图的特征是() A. 病理性Q波 B. 心电图ST段普遍弓背向下型抬高 C. 水冲脉 D. 二尖瓣型P波 E. 正弦波图形 参考答案:E 答案解析:1.心肌梗死急性期心电图特征性改变可见深而宽的Q波(反映心肌坏死),ST段呈弓背向上明显抬高(反映心肌损伤)及T波倒置(反映心肌缺血)。 2.慢性病变导致主动脉瓣关闭不全时,收缩压升高,舒张压降低,脉
A. United States-agreement B. Unlimited growth in population C. Pollution in the Great Lakes D. The limited supply of phosphates 参考答案:C 答案解析:[听力原文]8-10 W: I haven' t seen you for a while. Have you been away . M: Yes, I just got back fr