给出了年产量预测公式及瞬时产量与年产量相互换算的近似公式。
The prediction formula of yearly production and the approximation formula for reduction between the instantaneous production and yearly production are also presented.
论述了瞬时产量与阶段产量的差异，导出相应的公式，指出用预测年产量的传统方法的不合理性。
The relevant formula is derived out and the unreasonableness of forecasting annual output by using traditionally is pointed out.
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