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.
第一节 扰乱公共秩序的行为和处罚
。51吃瓜对此有专业解读
Bill Harwood has been covering the U.S. space program full-time since 1984, first as Cape Canaveral bureau chief for United Press International and now as a consultant for CBS News.
He said that while he was still working his way through submissions, it was clear there was "overwhelming support to modify the approach envisaged in the Carbon Neutral Roadmap".