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.
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（一）非正常损失的购进货物，以及与之相关的加工修理修配服务和交通运输服务；。业内人士推荐旺商聊官方下载作为进阶阅读