high-grade oil

基本解释

High-grade oil well pipes project will bring dual upgrade: capacity bottleneck remove and products mix upgrade.
安徽天大的高钢级油井管生产线的建成将带来双层升级：产能瓶颈的突破和产品档次的升级。
The product is made from hydroxy fatty acids lithium soap thickening high-grade basic oil and high-performance additive.
本产品由羟基脂肪酸锂皂稠化高级基础油并加入高效添加剂制成，是城市地铁轮轨的专用润滑脂。
The factors influencing the quality of high-grade oil in production are introduced. Its quality controlling methods are given.
介绍了在实际生产过程中影响一级油质量的因素，并提出了相应的控制方法。

Recent bidding rounds have attracted lucrative offers from scores of foreign firms, not surprising since Libyan oil tends to be high-grade and cheap to produce, and only a quarter of the country has been explored.
ECONOMIST: Libya