Inaprojectplan,whentheprojectmanagerscheouiesactivities,he(orsha)oftenuses()method,precedencerelationshipsbetweenacticitiesarerepresentedbycirelesconnectedbyoneormorearrows.Thelengthofthearrowrepresentsthedurationoftherelevantactivity.
A.causality diagram
B.Gantt?chart
C.histogram
D.arrow djgram
正确答案是D