与WHERE AGE BETWEEN 18 AND 23完全等价的是（） A: WHERE AGE＞18AND AGE＜23 B: WHERE AGE＞＝18AND AGE＜23 C: WHERE AGE＞18AND AGE＜＝23 D: WHERE AGE＞＝18AND AGE＜＝23

查询年龄不在20到23岁之间的学生的信息，所使用的语法命令为（） A: select * from student where age not between 20 and 23 B: select * from student where age between 20 and 23 C: select * from student where age not between 20 to 23 D: select * from student where not age from 20 to 23

查询年龄在20到23岁之间的学生的信息，所使用的语法命令为（） A: select * from student where age between 20 to 23 B: select * from student where age from 20 to 23 C: select * from student where age between 20 and 23 D: select * from student

22. Q: Where does the conversation most probably take place?

在学生表STUD中，查询年龄在20～23岁之间的学生的姓名(XM)、年龄(S A: 和所在系(SD)，实现该功能的正确SQL语句是______。A) SELECT XM, SA, SD FROM STUD B: WHERE BETWEEN 20＜SA＜23; C: SELECT XM, SA, SD FROM STUD D: WHERE SA BETWEEN 23 AND 20; E: SELECT XM, SA, SD FROM STUD F: WHERE SA NOT BETWEEN 20 AND 23; G: SELECT XM, SA, SD FROM STUD H: WHERE SA BETWEEN 20 AND 23;

已知：const int x = 23;定义指针q指向x，语句是（   ）

在学生表STUD中，查询年龄在20至23岁之间的学生的姓名(XM)、年龄(S A: 和所在系(SD) ，实现该功能的正确SQL语句是______。A) SELECTXM,SA,SD FROM STUD B: WHERE BETWEEN 20B．SELECT XM,SA，SD FROM STUD C: WHERE SA BETWEEN 23 AND 20； D: SELECT XM,SA,SD FROM STUD E: WHERE SA NOT BETWEEN 20 AND 23； F: SELECT XM,SA,SD FROM STUD G: WHERE SA BETWEEN 20 AND 23；

已知：const int x = 23;定义指针q指向x，语句是（ ）。 A: const int *q=&x; B: int * const q=x; C: const int *q=x; D: int * const q=&x;

可变成本函数是: VC = 23 + Q + 7Q2 ，这表明边际成本曲线是

4、听力题： Q: Where does the conversation probably take place?A、In a barB、At homeC、In the officeD、At the cinema