—My whole body feels weak and I've got a headache. — ( )?
A. How long ago did you get it this
B. How long have you been like this
C. How soon have you got it
D. How soon have you liked this
第1题:
He has been to Beijing . So ______ I.
A、have
B、does
C、do
D、did
第2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3题:
第4题:
I' m particularly proud of()I organized the finances.
A. who
B. which
C. how
第5题:
---DoyoulikewatchingTV?---Yes,I______.ButonlyafterIfinishmyhomework.
A.am
B.do
C.does
D.did
第6题: