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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.
I take 120 tablets a week after mesh operationMore on this story.
本篇聚焦“研发投入”与“研发人员”两大核心指标，从总量增长、结构分化、行业聚集与区域分布等多个维度，来观察近五年中国企业科创资源配置的真实图景与变迁。