参考答案和解析
参考答案:A
更多“I’ve always enjoyed_____A. swimmingB. to swimC. swim ”相关问题
  • 第1题:

    I watched Gerald for a while, but I didn't notice him ____ out of the water.

    A、swimming, come

    B、swim, come

    C、swim, coming

    D、swimming, coming


    答案:C

  • 第2题:

    I ________ always ________ that mistakes.

    A. am, making

    B. /, make

    C. will, make

    D. /, to make


    参考答案:B

  • 第3题:

    I can ( ) be a teacher. I’m not a very patient person.

    A. seldom B. ever C. never D. always


    正确答案:C

  • 第4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


    正确答案:C

  • 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;


    正确答案: