下列不合法的变量名为（）。 A: -student B: %student C: 12name D: student E: _student F: student_nameG、student0

查找student表中所有电话号码(列名：telephone)的第一位为8或6，第三位为0的电话号码（） A: SELECT telephone FROM student tWHERE telephone LIKE'[8,6]%0*' B: SELECT telephone FROM student WHERE telephone LIKE'(8,6)*0%' C: SELECTtelephoneFROMstudenttWHEREtelephoneLIKE'[8,6]_0%' D: SELECT telephone FROM student WHERE telephone LIKE'[8,6]_0*'

下面程序的输出结果是（ ）。class Student: count = 0 def __init__(self, name): self.name = name Student.count += 1s1 = Student("Alex")s2 = Student("Jack")print(s1.count)

以下语句可以返回Student表中的所有记录。<br/>Select * from Student where 1 or 0 and 1;

int main() { Student t1; Student t2(t1); //1 Student t3 = t1; //2 return 0; } Student为表示学生的类且未重载赋值操作符，则上述程序中有调用复制构造函数的是：

类Student代码如下：  A:  0 B:  null C:  false D:  编译错误

下面程序运行的结果是 struct Student { public int age; public string name; public Student(int age, string name) { this.age = age; this.name = name; } } class Program { static void Main(string&#91;&#93; args) { Student stu1 = new Student(18, "小方"); Student stu2 = new Student(24, "小刚"); stu2 = stu1; stu1.age = 30; stu1.name = "小燕"; Console.WriteLine("{1},{0}",stu2.age,stu2.name); } }

【单选题】使用命令添加用户student,设置密码为student,然后使用命令删除该用户。 A. useradd student passwd student userdel student B. useradd student passwd student sudo userdel student C. useradd student sudo passwd student sudo userdel student D. su root useradd student passwd student userdel student

在student关系中，要求年龄取值必须大于0，这样的完整性属于（）

【填空题】阅读程序写结果 public class Student { private static int sid = 0; private String name; int id; Student(String name) { this.name = name; id = sid++; } public void info() { System.out.println("My name is "+name+" No."+id); } public static void infoSta() { System.out.println(sid); } public static void main(String arg[]) { Student.sid = 100; Student st1 = new Student("huahua"); st1.sid = 2000; Student st2 = new Student("meimei"); st1.info(); st2.info(); } }