第6题: [单项选择]分离酸性皂苷和中性皂苷可选用的方法是() A. 丙酮沉淀法 B. 胆甾醇沉淀法 C. 乙醚沉淀法 D. 铅盐沉淀法 E. 碱水萃取法 参考答案:D
第7题: [单项选择]关于肝局灶性结节性增生的超声表现,说法错误的是()。 A. 为增生性病变而非肿瘤 B. 边界较清晰,无晕征 C. 肿块内有多条细带状强回声,呈放射状延伸 D. 肿块内一般无血流信号 E. 肿块可呈低回声、等回声及强回声 参考答案:D 答案解析:CDFI肿块内部有较粗、欠平整的动脉进入中心部,并在病灶中央分支呈"开花状"或"轮辐状"血流,声像图较典型。
第8题: [单项选择]下列何项易引起产后宫缩乏力()。 A. 过期妊娠 B. 双胎 C. 扁平骨盆 D. 早产 E. 妊娠合并心脏病 参考答案:B
第28题: [单项选择]What did children need to do in the earliest time mentioned by the speaker A. They needed to count and calculate money. B. They needed to read and write. C. They needed to alert moving objects. D. They needed to hunt and farm. 参考答案:D 答案解析:原文中有“School was not necessary fro them to learn other skills because their parents would teach them