IP地址块192.168.133.128/26的子网掩码可写为( )。
A、255.255.255.0
B、255.255.255.128
C、255.255.255.192
D、255.255.255.224
IP地址块192.168.133.128/26的子网掩码可写为( )。
A、255.255.255.0
B、255.255.255.128
C、255.255.255.192
D、255.255.255.224
如图8-43(a)所示的UML类图描绘的是设计模式中的(1)模式。如图8-43(b)所示的UML类图描述了该模式的一种应用,其中与图8-43(a)中的"Abstraction"对应的类是(2)。 空白(2)处应选择()
A、 DataAccess
B、 DataAccessImpl
C、 CustomerDM
D、 AccountDM
在VisualFoxPro中,有如下程序,函数IIF()返回值是( )。
A、女
B、男
C、T
D、F
Which of the following would be the BEST process for the technician to follow when beginning to diagnose a unit at a customers site?()
A、Check the printers error log, and then inform the primary user what the issue is.
B、Go directly to the printer and investigate any issues that are found.
C、Investigate the printers status, then ask the primary user to write down what they think is wrong.
D、Gather information from the primary user, and then evaluate the printers condition.
某软件公司欲开发一个Windows平台上的公告板系统。在明确用户需求后,该公司的架构师决定采用Command模式实现该系统的界面显示部分,并设计UML类图,如图8-41所示。图中与Command模式中的"Invoker"角色相对应的类是(1),与"ConcreteCommand"角色相对应的类是(2)。 空白(2)处应选择()
A、 Command
B、 Menultem
C、 Open
D、 BulktinBoardScreen
Oracle Net is responsible for establishing and maintaining the connection between the client application and the server. On the client side, Oracle Net is responsible for which three connectivity issues?()
AThe location of the server.
BThe Oracle user being connected.
CPrivileges and role information.
DProtocol involved in the connection.
EHow to handle exceptions and interrupts.