Nanometer technology is the leading industry in the 21st century. Study and application of nanometer technology has been regarded as the most important strategic point by every country.
纳米科技是21世纪的主导产业，世界各国把纳米科技的研究和应用作为战略重点。
Mathematics model of gray relevant analysis is used to study the main export industries and their relevance with international trade and to propose its leading industry in Heibei province.
尤其运用灰色关联分析的数学模型分析了河北省出口主要产业与外贸出口的关联程度，并在此基础上提出了确立主导产业。
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