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.
• 点评：硒化反应是决定铜锌锡硫硒薄膜品质的核心环节，若该过程中金属离子迁移的动力学失衡，会催生高浓度深能级的缺陷，最终造成显著的开路电压损失。该研究从材料生长机理层面，系统诠释了“离子迁移—缺陷—性能”的关系，并攻克了铜锌锡硫硒太阳能电池硒化阶段金属离子迁移难以调控的核心难题，为低成本、环保型薄膜太阳能电池的产业化发展提供了关键的技术支撑。（柯玉圆），这一点在体育直播中也有详细论述
，更多细节参见体育直播
pixel[2] = pixel[2] 0.04045f ? powf((pixel[2] + 0.055f) / 1.055f, 2.4f) : pixel[2] / 12.92f;。关于这个话题，咪咕体育直播在线免费看提供了深入分析
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