if(p->count == 0) {
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.，推荐阅读搜狗输入法下载获取更多信息
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(double)(end - start) / CLOCKS_PER_SEC * 1000,