设语言L={w|w∈{a,b}+且w中a和b的个数相等}，产生语言L的上下文无关文法是(28)。
- A．Ga=(VT={a,b}，VN={S，A，B}，S,P)，其中P为， S→a|aA|bSS A→aB|bS B→b|bA|aBB
- B．Gb=(VT={a,b}，VN={S,A,B}，S,P)，其中P为， S→b|bB|aSS B→aS|bA A→a|aB|bAA
- C．Gc=(VT={a,b}，VN{S,A,B}，S,P)，其中P为， S→aB|bA A→a|aS|bAA B→b|bS|aBB
- D．Gd=(VT={a,b}，VN={S，A，B}，S,P)，其中P为， S→aB|bA|s A→aS|bAA B→bS|aBB
-
(88)
- A．Linked
- B．Pointed
- C．Dynamic
- D．Static
-
(89)
- A．High-leve language
- B．Decision tree
- C．Pseudocode
- D．Flowchart
-
(71)data effectively is crucial for success in today's competitive environment. Managers must know how to use a variety of tools. Integrated data takes information from different sources and puts it together in a meaningful and useful way. One of the difficulties of this is the(72)in hardware and software.(73)integration uses a base document that contains copies of other objects.(74)integration uses a base document that contains the current or most recent version of the source document it contains.(75)provides an overview of the program written in" plain" English, without the computer syntax.
- A．Generalizing
- B．Sharing
- C．General-using
- D．Globalizing
-
(86)
- A．similarity
- B．interoperability
- C．diversity
- D．interaction
-
(87)
- A．Simulated
- B．Duplicated
- C．Dynamic
- D．Static
-
(83)
- A．of
- B．to
- C．as
- D．from
-
(84)
- A．forms
- B．groups
- C．consist
- D．Facilitates
-
(81)
- A．provides
- B．have
- C．expands
- D．limits
-
(82)
- A．elements
- B．objects
- C．services
- D．capability
-
(78)
- A．图形
- B．文件
- C．元组
- D．文件系统
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