题目内容
（请给出正确答案）
[主观题]
●The major difference between PERT and CPM networks is:APERT requires three time estimates
● The major difference between PERT and CPM networks is:
A PERT requires three time estimates whereas CPM requires one time estimate.
B PERT is used for construction projects whereas CPM is used for R & D.
C PERT addresses only time whereas CPM also includes cost and resource availability.
D PERT requires computer solutions whereas CPM is a manual technique.
E PERT is measured in days whereas CPM uses weeks or months.
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