...产品的功能(效用)与生产费用(成本)之间的比值: V=F/C 式中V表示为价值(value Index);F表示为功能评价值(Function Worthy);C表示为总成本(Total Cost)。价值工程包括三个基本要素:价值、功能和成本。
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客观评价森林生态系统服务功能价值动态变化,对于科学经营与管理森林资源具有重要的现实意义。
It has important significance for scientifically managing and running forest resources to evaluate the dynamic changes of the service function of forestry ecosystem system.
目的:评价磁共振心脏成像与超声心动图对左室功能的诊断价值。
Objective: To evaluate the diagnostic value of cardiac magnetic resonance imaging and echocardiography on left ventricular function.
目的:评价事件相关电位P 300作为血管性痴呆患者认知功能障碍客观指征的临床价值。
AIM: To evaluate the clinical value of event related potential P300 as assessment of cognitive function disorder in the patients with vascular dementia (VD).
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