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单选题 职业资格-PMP

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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