Shegotuptogetsomesleepingpillsbutfoundtherewasleftathome．（）A.nothingB.noneC.somethingD.nobody
She got up to get some sleeping pills but found there was _________ left at home．（ ）
A. nothing
B. none
C. something
D. nobody
已知字母组合成英语单词1、e e t t i n h r 2、e e r a t w h 3、o 2020-05-14 …
∮1dx/(x^2+y^2+z^2)ds,其中,曲线x=(e^t)sinty==(e^t)cost 2020-06-03 …
重新排列字母,写出单词1.s,a,p,e,c,2.r,o,e,t,c,k,3.d,c,o,o,t, 2020-06-06 …
用以下英文宇母填在上a,a,a,a,a,a,b,e,e,d,e,e,e,e,e,e,f,g,g用以 2020-06-24 …
给定文法G[E]:E->T+E|T,T->num,给出句子2+3-4的最左推导过程、最右推导过程和 2020-07-08 …
已知向量a≠e,|e|=1,满足:任意t∈R.已知向量a不等于e,|e|=1,对任意t属于R,恒有 2020-07-25 …
编译原理题目5、设有文法（E）：E→E+T|TT→T*F|FF→(E)|i1)该文法含有左递归吗?若 2020-11-23 …
编译原理中FIRSTVT和LASTVT如题E->E+T.T->T*F|F.F->(E)|id求FIR 2020-11-23 …
2-1设文法G[E]的产生式集为：EàE+T|E-T|TTàT*F|T/F|FFà(E)|i（1）给 2020-11-26 …
已知文法G:(1)E→E+T|T(2)T→T*F|F(3)F→P↑F|P(4)P→(E)|i1．已知 2020-12-07 …