题目：
The “three-point estimates” method for estimating activity duration differs from the “single point, most-likely estimate” method in that it uses ______ .
A．an average of the three estimated durations to estimate activity duration
B．“dummy” activities to represent logic ties
C．“free float” instead of “total float” in the schedule calculations
D．bar charts instead of logic diagrams to portray the schedule
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
