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支柱产业
一国或地区在一定时期内,现有产业结构系统中具有举足轻重地位,其产值在国民生产总值中占有较大比重,对支撑整个国民经济具有决定性意义的产业或产业群体。
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pipeline mileage post
pipeline network management of chemical industry
pipeline oil (gas) mileage
pipeline operation
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Pipeline Research Council International
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