题目内容

Complete the sentences according to the clues in brackets to help you. The first letters are provided.1.Don't click on that link! It looks like a s__. (an illegal trick to get money)

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在算符优先分析法中,用_____来刻画可归约串。

A. 直接短语
B. 句柄
C. 最左素短语
D. 素短语

以下文法,属于算符文法的是( )

A. S→+Sa | aS | a
B. S→S+a | a-b | bSSa
C. S→S+S | aSSa | a
D. S→a+b | SS-a | ε

2.算符优先分析过程中,如果待归约串为 E+F,可使用下列哪个产生式归约( )

A. E→E*F
B. E→T*F+F
C. E→(T+F)
D. E→T+T

3.对于下列文法,F的FIRSTVT集等于()B->BoT|TT->TaF|FF->nF|(B)|t|f

A. {n,(,t,f}
B. {a,n,(,t,f}
C. {o,a,n,(,t,f }
D. {a,n,),t,f}