功能值(F)是计算整个价值(V=F/C)的基础。计算功能值的关键是计算功能域或末端功能的功能值。 所谓功能域是指独立完成某种功能的一个系统,如功能系统模式图中点划线所包容的范围(见下图),即为一阶功能域;图中虚 The function value (F) is the basis for calculating the entire value (V=F/C). The key to calculating the functional value is to calculate the function value of the functional domain or end function. The so-called functional domain refers to a system that independently performs a certain function, such as the scope of the dash-dotted line in the functional system mode diagram (see the figure below), that is, the first-order functional domain;