李天威说，新标准之所以设置五年过渡期，就是要留出足够的缓冲调整时间，给结构调整、源头减排等治本之策，预留时间和空间。
Strict evaluation is the simple choice. If you want laziness, Peyton Jones's
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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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