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?

已知：const int x = 23;定义指针q指向x，语句是（   ）

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

Q23.Where is Costa Rica? A: a). It's situated in South America. B: b). It's above Mexico. C: c). It's located in Central America. D: d). It's in South Africa.

Let p(x)= x3+(5m+1)x+5n+1, where m,n are integers. Which of the following statements is not true?( ) A: Q[x]/ is field. B: p(x) is irreducible over Q[x] C: x+ has multiplicative inverse in Q[x]/. D: Q[x]/ is an integer domain but not a field