关系R(A,B,C,D)和S(B,C,D)进行笛卡儿运算，其结果集为(62)元关系。
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To accommodate the longest path allowed by 802.3, the slot time has been set to 512 bit times, or(75).
- A．521μs
- B．5.12μs
- C．0.512μs
- D．512μs
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Every host and muter on the Internet has an IP address,which encodes its(69).
- A．host number
- B．host number and socket
- C．network number
- D．host number and network number
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When you choose a command name that is followed by "…" on menu, a(72)box appears in which you provide more information.
- A．dialog
- B．list
- C．check
- D．text
-
The Pentium includes hardware for both segmentation and paging. Both mechanisms can be disabled, allowing the user to choose from four distinct views of memory. Now the most frequently used view(such as UNIX System V)is(67).
- A．Unsegmented unpaged memory
- B．Unsegmented paged memory
- C．Segmented unpaged memory
- D．Segmented paged memory
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The typical firewall consists of two packet filters and a(an)(68).
- A．router
- B．bridge
- C．application
- D．server
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In a computer, which of the following is the longest period?(66).
- A．Beat period
- B．Machine period
- C．Instruction period
- D．CPU period
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(73)
- A．右递归
- B．左递归
- C．直接左递归
- D．直接右递归
-
(71)
- A．短语
- B．素短语
- C．句柄
- D．直发短语
-
(72)
- A．归约
- B．移进
- C．推理
- D．推导
-
(70)
- A．算符优先分析法
- B．LL(1)分析法
- C．递归子程序分析法
- D．预测分析法
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