2019.8.8每日一题：
A network diagram shows that the earliest an activity could start is at the end of week 7 and that it must be completed by the start of week 20. The activity requires a total of 10 business days to complete. In terms of weeks, what is the float for the performance of this activity?
A. 3
B. 10
C. 13
D. 17
网络图显示，某项活动的最早开始时间是在第 7 周结束时，并且必须在第 20 周开始之前完成。这项活动总共需要 10 个工作日完成。那么这项活动绩效的浮动时间是多少周？
A.3
B.10
C.13
D.17
答案：B
解析：10个工作日就是2周，第20周开始之前完成就是第19周结束时，因此浮动时间=19-7-2=10周。