在student表中有name和age两个字段以下查询语句不能正确执行的是 A: .mdf B: .ldf C: .tif D: .ndf

【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

中国大学MOOC: MDF水泥的优点包括（ ）。

‏删除数据表student的命令是________。‏ A: drop table student; B: drop student; C: delete table student; D: drop student;

VBA中打开“student”表的语句是( )。 A: Docmd．OpenForm”student” B: Docmd．OpenQuery"student" C: Docmd．OpenTable"student" D: Docmd．Openreport"student"

【单选题】定义一个学生类Student,则初始化一个学生对象的语句是( A. Student s ； B. Student s = new Student(); C. Student s = new student(); D. Student s = s.student();

声明并创建一个学生类Student的对象s,下列语法格式正确的是: A: Student s = Student(); B: Student s; C: Student s = new Student(); D: Student s = new ();

Given that Student is a class, how many reference variables and objects are created by the following code? Student studentName, studentId; studentName = new Student(); Student stud_class = new Student();

用于删除数据表student正确的语句是： A: drop student B: delete student C: drop database student D: drop table student

Li Ting is a ______. A: first-year student B: second-year student C: third-year student