在下面的项目网络图中（时间单位为天），活动B的自由时差和总时差分别为（ ）。
- A.0、0
- B.0、1
- C.1、0
- D.1、1
正确答案及解析
正确答案
解析
本工作的自由时差-等于紧后工作最早开始时间与本工作最早完成时间差的最小值。
本工作的总时差=本工作最迟开始时间-本工作最早开始时间 或者 本工作的总时差=本工作最迟完工时间-本工作最早完工时间，所以活动B的自由时差和总时差分别为0和1，
正向推导、反向推导得出B的ES为2，EF为5，LF为6，C的ES为5，EF为9，LS为6，LF为10.所以B的自由时差=C的ES-B的EF=5-5=0，B的总时差=B的LS-B的ES=3-2=1
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