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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.
（二）违反国家规定，在文物保护单位附近进行爆破、钻探、挖掘等活动，危及文物安全的。。业内人士推荐夫子作为进阶阅读
Demographics and interest reports:。关于这个话题，体育直播提供了深入分析
Photograph: Brad Bourque