第15题: [单项选择]收缩中晚期喀喇音可见于下列疾病中的() A. 主动脉瓣狭窄 B. 肺动脉瓣狭窄 C. 室间隔缺损 D. 主动脉瓣关闭不全 E. 二尖瓣脱垂 参考答案:E 答案解析:收缩中晚期喀喇音可见于二尖瓣脱垂。
第16题: [单项选择]Two systems of weights and measures used in the U.S. are ______. A. the U. S. Customary System and the metric system B. the International System and the metric system C. the Imperial System and the metric system D. the Customary System and the Imperial system 参考答案:A 答案解析:文章第一段提到了四个度量衡制度的名称,它们是the U.S.Customary System, the International System of Units,the metric system及