第9题: [单项选择]{{B}}{{I}}Questions 11~13 are based on the following passage.{{/B}}{{/I}}When is this talk most likely given A. During the first week of class. B. During the mid-term week. C. On the last day of class. D. On the last day of exam week. 参考答案:C
第21题: [单项选择]在Visual FoxPro中,嵌套查询是基于( )的查询 A. 2个关系 B. 3个关系 C. 多个关系 D. 2个或3个关系 参考答案:C 答案解析:[解析] 在Visual FoxPro中,嵌套查询是基于多个关系的查询.这类查询所要求的结果出自一个关系,但相关的条件却涉及多个关系。