20.(2.5分) A: Are you a new student? B: ______________ . A、Yes, I am B、No, I am C、Yes, I do D、I am a teacher ...
(单选题)18: 假设已经定义好了一个类student,现在要定义类derived,它是从student私有派生的,定义类derived的正确写法是( )。 A: “class derived::student prived {// …} ;” B: “class derived:student public {// …} ;” C: “class derived:pri...
(单选题) 18: 假设已经定义好了一个类student,现在要定义类derived,它是从student私有派生的,定义类derived的正确写法是( )。 A: “class derived::student prived {// …} ;” B: “class derived:student public {// …} ;” C: “class derived:pr...
(单选题)7: 一个数据库名为student ,要想打开该数据库,应使用命令( )。 A: OPENstudent B: OPENDATAstudent C: USEDATAstudent D: USEstudent ...
(单选题) 14: Many a student ______ the importance of learning a foreign language. A: have realized B: has realized C: have been realized D: has been realized ...
4. 若用如下的SQL语句创建一个student表:CREATE TABLE student( NO C(4) NOT NULL,NAME C(8) NOT NULL,SEX C(2),AGE N(2)) 可以插入到student表中的是()。 A. ("0251","王五","男",25) B. ("0251","王五",NULL,NULL) C. (NULL,"王五","男",25...
8. 若用如下的SQL语句创建一个student表:CREATE TABLE student(NO C(4) NOT NULL,NAME C(8) NOT NULL,SEX C(2),AGE N(2)) 可以插入到student表中的是()。 A. ("0251","王五",男,"25") B. ("0251","王五",NULL,NULL) C. (NULL,"王五","男"...
4. public class boy { } public class girl { } public class student extends boy,girl { } 上述定义( ) A. 正确 B. 错误,Java不允许多重继承 C. 错误 boy和girl应该用 D. 隔开 E. 错误,应该使用implements关键字 ...
12. public class boy { } public class girl { } public class student extends boy,girl { } 上述定义( ) A. 正确 B. 错误,Java不允许多重继承 C. 错误 boy和girl应该用 D. 隔开 E. 错误,应该使用implements关键字 ...