[填空题]Human language enable their users to symbolize objects, events and concepts which are not present (in time and space) at the moment of communication. This quality is labeled as
第2题: [单项选择]The current price of XYZ Inc. is $40 per share with 1000 shares of equity outstanding. Sales are $ 4000 and the book value of the firm is $ 10000. What is the price/sales ratio of XYZ Inc. A. 0.010. B. 10.000. C. 4.000. 参考答案:B 答案解析:The price/sales ratio is (price per share)/(sales per share)=(40)/(4000/1000)=10.0.
第17题: [单项选择]为缺陷病毒,必需在其他肝炎病毒的辅助下才能复制的肝炎病毒是() A. 甲型肝炎病毒 B. 乙型肝炎病毒 C. 丙型肝炎病毒 D. 丁型肝炎病毒 E. 戊型肝炎病毒 参考答案:D 答案解析:缺陷病毒是指因病毒基因组不完整或者因基因某一点改变而不能进行正常增殖的病毒。丁型肝炎病毒是一种缺陷病毒,必须在乙型肝炎病毒辅助下才能复制。