An engineering method empirical formula applicableto actual production is also deduced.
由此推导出了适合该厂生产实际的工程法经验计算公式。
Methods employed include income method, empirical analysis and comparative study.
研究方法：收益还原法，实证分析法，比较研究法。
Methods employed include income method, empirical analysis and comparative study.
研究方法：收益还原法，实证分析法，比较研究法。
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