In a project plan，when the project man...

单项选择题In a project plan，when the project manager schedules activities，he（orshe）oftenuses（）method，precedence relationships between acticities are represented by cireles connected by one or more arrows. The length of the arrow represents the duration of the relevant activity.

A、causalitydiagram
B、Ganttchart
C、histogram
D、arrowdiagram

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