-Larry is the biggest airhead I've ever met. He always makes careless mistakes, and he's a pain to work with. - ________ . You'll always have some co-workers that are harder to work with than others, you know.
:A I have the same feeling to you ;
B You really have it ;
C You shouldn't be so negative
第1题:
I've _____ these lines again and again but I still keep forgetting them.
A. gone off
B. gone about
C. gone over
D. gone through
第2题:
Ted: I'm sorry. I damaged your mp3 player.
Larry: __________
A、Well,it's OK.
B、No,it's all right.
C、Oh,I'm sorry.
D、What!
第3题:
I can ( ) be a teacher. I’m not a very patient person.
A. seldom B. ever C. never D. always
第4题:
A. am, making
B. /, make
C. will, make
D. /, to make
第5题:
B 宽度优先(种子染色法)
5.关键路径
几个定义: 顶点1为源点,n为汇点。
a. 顶点事件最早发生时间Ve[j], Ve [j] = max{ Ve [j] + w[I,j] },其中Ve (1) = 0;
b. 顶点事件最晚发生时间 Vl[j], Vl [j] = min{ Vl[j] – w[I,j] },其中 Vl(n) = Ve(n);
c. 边活动最早开始时间 Ee[I], 若边I由<j,k>表示,则Ee[I] = Ve[j];
d. 边活动最晚开始时间 El[I], 若边I由<j,k>表示,则El[I] = Vl[k] – w[j,k];
若 Ee[j] = El[j] ,则活动j为关键活动,由关键活动组成的路径为关键路径。
求解方法:
a. 从源点起topsort,判断是否有回路并计算Ve;
第6题: