在工程网络计划中，工作M的最早开始时间为第16天，其持续时间为5天。该工作有三项紧后工作，他们的最早开始时间分别为第25天、第27天和第30天，最迟开始时间分别为第28天、第29天和第30天。则工作M的总时差为 （ ） 天。
- A.5
- B.6
- C.7
- D.9
正确答案及解析
正确答案
解析
M 活动的早开始日期(ES)=16天，最早结束日期(EF)=21天；使用逆推法计算最迟结束日期 (LF)=28天，开始日期(LS)=28—5=23 天。总时差=LS—ES 或 LF—EF总时差=23—16=7 天因此选C。
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