credit又来了，何意? several parameters were identified at each site that have the biggest economic impact on fixed and variable costs in this generalized model, including ethylene capacity, regional feedstock and energy costs, regional by-product credits, logistics and vertical integration capability, geographic location, plant age and size, other variable costs, and other fixed costs. 标红处中译文，关键是credit啥意思？ （结束已讨论，因涉及到保密，故对原帖进行编辑。） 查看更多
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