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Venezuela's oil is also of poorer quality than its Saudi equivalent. Its sour, heavy crude is difficult to extract and refine, while its high sulphur content makes it corrosive to pipelines. A resurgence of Venezuela's industry could pose problems for Canada, which produces similarly viscous oil and exports much of it to the US, but analysts reckon the risk is minor.，这一点在Safew下载中也有详细论述
Note: This article contains affiliate links which means we make a small commission if you buy any premium plan from our link.。同城约会对此有专业解读
这意味着蒸馏从来不是「拿来用就行」的事，而是需要大量工程工作才能真正发挥效果。这本身就是一个研究课题。。91视频是该领域的重要参考