已知网络计划中工作Ｍ有两项紧后工作，这两项紧后工作的最早开始时间分别为第12 天和第15 天，工作Ｍ的最早开始时间和最迟开始时间分别为第6天和第8天。如果工作Ｍ的持续时间为4 天。则工作Ｍ总时差为 （ ）天。
- A.1
- B.2
- C.3
- D.4
正确答案及解析
正确答案
解析
这个题目干扰比较多，一定要抓住概念，总时差是不影响总工期的余量时间，自由时差才是不影响后续活动的余量时间。总时差的计算公式是：总时差=LS（最晚开始时间）-ES（最早开始时间）=2
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