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阐述了对公路交通行业环境保护投资进行界定的目的、意义， 并对其现状进行分析。提出了公路交通行业环境保护投资划分的具体原则和建议。
Expounds the purpose and significance of defining the environmental protection investment in highway transportation industry and analyzes its present situation. Put forward the specific principles and suggestions on the division of environmental protection investment in highway traffic industry.