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Dig leader Peter Crawley said he had a gut feeling about the site before the excavation began.，详情可参考下载安装 谷歌浏览器 开启极速安全的 上网之旅。
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.，推荐阅读WPS下载最新地址获取更多信息
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