1.属性文法(语法制导的定义)(SyntaxDirected- Definition)。 形式:CFG的每个产生式A→对应与之相关联的一个语义规则(semantic rules)集合,每条规则形如b:=f(c1,C2,,ck),其中f是一个函数,b1C2 ck是该产生式中文法符号的属性(attributes),b有两个可能(1)是A的一 个属性,C1,C2,,Ck是产生式右部文法符号的属性或A的其它属性称b是A的 综合属性(synthesized attribute),(2)是产生式右部某个文法符号x的一个属 性,并且C12,…,C是A或产生式右部任何文法符号的属性则称b是文法符号 x的继承属性( inherited attribute) 函数f通常以表达式的形式出现

一、选择题 A型题 1.e2.e3.c4.c5.d6.c7.a8.a9.b10.d11.d 12.a13.a14.e15.d16.d17.d18.19.c20.c21.c22.c

A1 Prokaryotes A2 Eukaryotes A3 Microscopy A4 Cellular fractionation

在数学分析课程中我们知道,微分与积分具有密切的联系.一方面,若f(x)在 【a,b]上连续,则对任意x∈[a,b]成立f(d=f(x)另一方面,若f(x)在[a,b] 上可微,并且f(x)在[a,b]是 Riemann可积的,则成立牛顿莱布尼兹公式 f'(x)dx f(b)-f(a)

一、选择题 A型题 1.c2.c3.c4.b5.d6.b7.e8.d9.a10.d11.b12.b 13.b14.e15.16.C17.C18.C19.20.b21.d22.d23.c 24.b25.e26.e27.c28.c29.d30.c31.a32.a33.b34.d

1.设向量β可由向量组a1,a2,……,as线性表示,但不能由a1,a2,…,a-1线性表示证明:向量

On Sunday, March 30 a fight occurred in the Club Room, the employees’ cafeteria of Mid-States Community Services’ Housing Department, between a housing administrator-intern and a building technician. The two men grappled for several seconds, rolling on the floor and throwing punches, until they were pulled apart by two interns and another technician who were standing by when the fight broke out. Aside from a bloody nose and a puffed left eye, the intern who had been

构成:下推栈,预测分析表,控制程序,输入串 1. 预测分析表 形式:M[A,a]矩阵, AVN,a VT{$} 内容:A→α或出错标志(空白)

(1)FIRSTVT集 FIRSTVT(P)={a|Pa…,或PQa…,aVT ,Q VN} 若P→a…或P→Qa…, 则aFIRSTVT(P); 若P→Q…, 则FIRSTVT(Q)FIRSTVT(P); 直至FIRSTVT(P)不再增大

Ch. 13 Difference Equations 1 First-Order Difference Equations Suppose we are given a dynamic equation relating the value y takes on at date t to another variables Wt and to the value y took in the previous period: where o is a constant. Equation(1)is a linear first-order difference equation a difference equation is an expression relating a variable yt to its previous values