25. 有下列文法： S->Pa|Pb|c P->Pd|Se|f 该文法是______。 A. LL(1)文法 B. SLR(1)文法 C. a和b D. 都不是 ...

8. 设文法G（S为其开始符号）产生式如下： S→aSb|ab|ε 则G是一个 A. LR（1）文法 B. SLR（1）文法 C. 三型文法 D. 二型文法 ...

3. 若文法 G 定义的语言是无限集，则文法必然是前后文无关的 A. 错误 B. 正确 ...

20. 下面三个文法中，为SLR(1)文法的是______。 G1：P->PaP|b G2：P->bPb|cPc|b|c G3：P->bPb|bPc|d A. 仅Gl B. 仅G2 C. 仅G3 D. G2和G3 E. 都不是 ...

7. Not until 1874_______developing in earnest. A. the story began B. did the story begin C. did the story began D. does the story begin ...

5. The author's intention in writing this article is to make Americans realize that ________ . A. it is dangerous to ignore their foreign friends B. it is important to maintain their leading role in world affairs...

1. In the days immediately following hurricane Andrew's deadly visit to South Florida, Allstate Insurance hastily dispatched more than 2,000 extra claim adjusters to the devastated area to assist the 200 stationed t...

33. Just as the soil is a part of the earth, _____ the atmosphere. A. as it is B. the same as C. so is D. and so is ...

1. We wondered how the information was _______ to the press before it was officially announced. A. dropped B. seeped C. leaked D. dripped ...

12. His argument ________ that people still regard television as a favorable, beneficial, wondrous influence upon the family but this is no longer the case. A. presents B. offers C. concerns D. presupposes ...