is the budgeted amount for the work actually completed on the schedule activity
is the budgeted amount for the work actually completed on the schedule activity or WBS component during a given time period．
A．Planned value
B．Earned value
C．Actual cost
D．Cost variance
正确答案：B解析：挣值是在给定时期内按进度活动或WBS部件所完成工作的预算值。
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