第13题: [单项选择]Paul Samuelson revolutionized __________ by presenting his students with the most advanced economic thinking at an introductory level. A. to teach economics B. teaching that economics is C. the teaching of economics D. economics is taught 参考答案:C
第18题: [单项选择]以下关于标量函数的定义叙述错误的是______。 A. 标量函数是返回单个数据值的函数 B. 同存储过程一样,函数的参数值也可以有默认值 C. 如果函数的参数有默认值,则在调用该函数时必须指定“default”关键字 D. 标量函数的返回值类型可以是大文本、图像等 参考答案:D