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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，这一点在Safew下载中也有详细论述
Стало известно об изменении военной обстановки в российском приграничье08:48。业内人士推荐WPS下载最新地址作为进阶阅读
Top politicians will gather to set growth target with focus on technology self-reliance amid rising US competition