以下对于数据库的几种关键字的描述中，错误的是(20)。
- A．主关键字一定是候选关键字
- B．候选关键字一定是超关键字
- C．超关键字—定是合成关键字
- D．外部关键字一定是某个关系的候选关键字
-
(76)
- A．see
- B．visiting
- C．call
- D．access
-
(77)
- A．immediacy
- B．indirectly
- C．direct
- D．directly
-
(75)
- A．communicate
- B．communications
- C．correspond
- D．correspondence
-
(74)
- A．communion
- B．share
- C．partake
- D．pool
-
When you are(71)a home or small office network, it is recommended that you use the Network Setup Wizard in Windows XP Home Edition to enable Internet Connection Sharing. The Network Setup Wizard automatically provides all of the network settings you need to(72)one Internet connection with all the computers in your network.
- After ICS is enabled, and you make sure that all of your computers can(73)with each other and they have Internet(74)you can use programs such as Internet Explorer and Outlook Express as if they were(75)connected to the Internet service provider(ISP). When
- A．creating
- B．reach
- C．going for
- D．setting up
-
(71)
- A．VLAN
- B．LANE
- C．VPN
- D．IPOA
-
(72)
- A．Coaxial cable
- B．Optical fiber
- C．Unshielded Twisted-pair Cable
- D．Shielded Twisted-pair Cable
-
(70)
- A．PPP
- B．PAP
- C．CHAP
- D．LCP
-
In(66)the strength of the carder signal is varied to represent binary 1 or 0.(67)is a system that can map a name to an address and conversely an address to an name.(68)is a three-way handshaking authentication protocol that it's packets are encapsulated in the point-to-point protocol.(69)is an approach that enables an ATM Switch to behave like a LAN switch.(70)is an guided media which is made of glass or plastic and transmits signals in the form. of light.
- A．ASK
- B．PSK
- C．FSK
- D．FDM
-
(69)
- A．NAT
- B．NCP
- C．DDN
- D．DNS
高级经济师考试试题精选练习（1）
高级经济师考试模拟练习题之单选题（1
高级经济师考试试题精选练习（2）
高级经济师考试试题精选练习（3）
高级经济师考试试题：经济法案例试题精
高级经济师考试模拟试题及答案
高级经济师考试试题及答案：单选练习题
高级经济师考试试题：经济法案例试题精
高级经济师考试模拟题及答案练习(1)
高级经济师考试模拟题及答案练习(2)