预算成本及实际成本中的累积成本及人工工时按时间进度划分其图形被称为()
A.趋势线
B.趋势分析
C.S曲线
D.挣值报告
函数至少在取a、b、c、d四个参数值时与U形平均成本曲线相一致。
Suppose the long - run total cost function for an industry is given by the cubic equation TC =a+bq+cq2+dq3. Show (using calculus ) that this total cost function is consistent with a U - shaped average cost curve for at least some values of a, b, c, d.