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。

youdao

Restarting an industrial civilisation might be a lot harder the second time round, because we have used up most of the easily available resources, from oil to high-grade ores.

重新创建一次工业文明要困难得多，因为我们已经用尽了大部分的可用资源，不论是石油还是高级矿石，那时都已经所剩不多。

youdao

Therefore, the high-grade decorated panels elm, used as wood-margin lines to seal oil.

所以对于高档饰面板榉木、用做收边的木线要做封油处理。

youdao

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