第20题: [单项选择]面神经管病变()。 A. 周围性面神经麻痹,伴外耳道疱疹 B. 周围性面神经麻痹,复视,同侧眼球外展不能,对侧中枢性偏瘫 C. 周围性面神经麻痹,味觉缺失,听觉过敏 D. 周围性面神经麻痹,对侧偏瘫 E. 周围性面神经麻痹,耳聋,耳鸣 参考答案:C
第21题:[单选题]2.The marginal rate of transformation (MRT) of X for Y refers to: A.A.the amount of Y that a nation must give up to produce each additional unit of X B.B.the opportunity cost of X C.C.the absolute slope of the production frontier at the point of production D.D.all of the above 参考答案:D