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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.
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└─ Network Egress Control，更多细节参见91视频
乔布斯之所以否决一台触控 Mac，其实是因为他想得会更深远一点：如果要为 Mac 增加触控屏，那必须要围绕全新的「触控」交互，大改整个 Mac 的界面，进一步发挥触屏的价值，要不然就不加。，详情可参考同城约会