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不同阶段的投资费用与生产成本估算精确度不同：机会研究阶段为±30%，初步可行性研究阶段为 ±20%，可行性研究阶段为±10%
commer.	The accuracy of estimates of investment and production costs varies greatly at different stages: at the opportunity study, it is ± 30%; at prefeasibility study, ± 20%, at feasibility study, ±10%