13，14，16，21，()，76

A.Pointintimecopy

B.MetroMirrorandGlobeMirror

C.GlobeCopy

D.Allofabove

A.193.130.56.0

B.198.37.16.15

C.198.130.16.15

D.198.130.56.15

A.ftpd

B.imapd

C.pop3d

D.sendmail

ith a value in the WORKDEPT column has a row with a corresponding value in the DEPTNO column of the DEPARTMENT table?（）

A.A check constraint on the EMPLOYEE table

B.A unique constraint on the EMPLOYEE table WORKDEPT column

C.A foreign key reference from the DEPARTMENT tables DEPTNO column to the WORKDEPT column of the EMPLOYEE table

D.A foreign key reference from the EMPLOYEE tables WORKDEPT column to the DEPTNO column of the DEPARTMENT table

A．错误

B．正确

255.0.Noslotsareavailableforexpansion.Whichofthefollowingproceduresshouldbeperformedtomakeitfunctionasagateway？（）

A.Enableipforwardingonly

B.Configureanaliasonthesameinterfaceandenableipforwarding

C.Addasecondinterfaceintothesamesubnetandenableipforwarding

D.Addasecondinterfaceintoadifferentsubnet，andenableipforwarding

A.Unique

B.Check

C.Referential

D.Informational

A.When view V1 is created

B.Each time the REFRESH VIEW v1 statement is executed

C.Each time an SQL statement is executed against view V1

D.Only the first time an SQL statement is executed against view V1

A.服务器

B.存储

C.软件和自动化

D.人员

E.基础设施和网络

F.自然灾害

G.人为破坏

H.服务和技能

ame VARCHAR(9), dept SMALLINT CHECK (dept BETWEEN 10 AND 100),job CHAR(10) CHECK (job IN (‘Sales‘,‘Mgr‘,‘Clerk‘)), hiredate DATE, salary DECIMAL(7,2), comm DECIMAL(7,2), PRIMARY KEY (id), CONSTRAINT yearsal CHECK (YEAR(hiredate) > 2004 OR salary > 80500) );Which of the following INSERT statements will fail?（）

A.INSERT INTO employee VALUES (2, ‘Smith‘, 80, ‘Mgr‘, ‘09/03/2006‘, 80000, NULL)

B.INSERT INTO employee VALUES (4, ‘Smith‘, 86, ‘Mgr‘, ‘07/14/2003‘, 90000, NULL)

C.INSERT INTO employee VALUES (1, ‘Smith‘, 55, ‘Sales‘, ‘07/14/2003‘, NULL, NULL)

D.INSERT INTO employee VALUES (3, ‘Smith‘, 33, ‘Analyst‘, ‘11/26/2006‘, 90000, NULL)