第7题: [单项选择]Questions 19 to 21 are based on the conversation you have just heard.A. In a restaurant. B. In a hotel. C. At the airport. D. At a travel agency. 参考答案:B 答案解析:[解析] 19-21 M:I’d like to check in, please. W:I’m terribly sorry,sir,but there are no rooms ava
第18题: [单项选择]室性期前收缩心电图的特征不包括() A. 提前出现的QRS波群 B. 宽大畸形的QRS波群 C. 不完全代偿间歇 D. QRS波群前无P波 E. 完全代偿间歇 参考答案:C 答案解析:室性期前收缩心电图表现:①提前出现的QRS波群,时限超过0.12秒,宽大畸形,其前无P波;②ST-T与主波方向相反;③代偿间歇完全。故此题正确的选项为C。