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0、1，如果活动A的实际开始时间是5月1日早8时，在不延误项目工期的情况下，活动B最晚应在（ ）前结束。
- A.5月5日早8时
- B.5月6日早8时
- C.5月7日早8时
- D.5月8日早8时
正确答案及解析
正确答案
解析
将上图按六时标注填完：工作B的总时差为：LSB-ESB=3-2=1（天）工作B的自由时差为：ESC-EFB=5-5=0（天）根据题意，在不延误项目工期的情况下，活动B最晚应在“第6天末结束”（即活动B的LF），注意，这是按照网络图的时间定义，按此定义，项目应在“第0天末开始”。结合题干，“第0天末”等价于“5月1日早8时”，所以，“第6天末”就是“5月7日早8时”。提示：可以画时标网络图（以线段的长度表示时间）辅助思考。
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