第24题: [单项选择]Sound waves reflected from a hill can be used to calculate the______. A. Speed of sound B. time between a sound and ifs echo C. height of the hill D. distance of the hill 参考答案:D 答案解析:[听力原文] 18-20
Under proper conditions, sound waves will be reflected from a hillside or other su
第31题: [单项选择]关于肝血管瘤的诊断,错误描述是() A. 好发于女性 B. 肿瘤90%为单发 C. 肿瘤直径超过10cm者,称为巨大海绵状血管瘤 D. CT平扫表现为肝实质内境界清楚的低密度肿块,CT值约30Hu E. 增强扫描出现典型的"早出晚归"征象 参考答案:C 答案解析:肿瘤直径超过5cm者,称为巨大海绵状血管瘤。