挣值法成本控制方法中，成本偏差的表达方式正确的是（）。A.已完成工作预算成本-计划完 参考答案：C
英语翻译 专业翻译：Three basic parameters of the law of earning value：A budget expenses(BCWS)which plan the work load.Promptly according to sanction approved progress plan and budget get some work necessary accumulative total value that injected capital into that point should finish for the moment planned costs，it means planning the project to measure and budget for the sum of the product of the unit price.It's time，worth，weigh project progress and project one scale or basis of expenses.BCWS refers to in the course of project implementation some periodic plan requires budget man-hour(or the expenses)when the work load finished needs.Formula：BCWS=The work load of the plan is budget quota*.BCWS mainly reflects work load instead of reflecting man-hour(or the expenses)that should be consumed that the progress plan should be finished.For example：Plan to install a WEB and insert the server，estimates hardware，software，installation，etc.plan in one week in some project，buy the software and hardware and。
挣值法成本控制方法中，成本偏差的表达方式正确的是（）。A.已完成工作预算成本－计划完成工作预算 正确答案：C
什么是挣值？什么是挣值管理？ 挣值（EV，Earned Value），指项目实施过程中某阶段实际完成工作量及按预算定额计算出来的工时（或费用）。又叫已完成工作量的预算成本（BCWP，Budgeted Cost for Work 。
控制成本用挣值法时的三个成本值及四个评价指标是如何计算的，如何应用？ 控制成本用挣值法时的三个成本值及四个评价指标计算和应用方法：三个成本值：(1)已完成工作预算成本为BCWP：已完成工程量X预算成本单价；(2)计划完成工作预算成本BCWS：BCWS=。
