第2题: [填空题]Choose the appropriate letters A-C.People usually have A. a mixture of fingertip patterns which are identical on each hand. B. a mixture of patterns with similarities between hands. C. a different pattern on each hand. 参考答案:B
第3题: [单项选择]判断颈动脉狭窄的血流动力学指标,下列须除外的是()。 A. 狭窄处收缩期峰值速度 B. 狭窄处舒张末期血流速度 C. 狭窄处血流阻力指数 D. 收缩期峰值血流速度比 E. 舒张末期血流速度比 参考答案:C 答案解析:阻力指数用于判断血流的外周阻力,不是反映血管狭窄程度的指标。