Before travelling we must ensure the availability of petrol and oil.

旅行前，我们必须确保能够买到汽油和机油。

Check the engine oil level regularly.

要时常检查机油量。

Preparation of EGD air-cooling two-stroke-cycle gasoline engine oil and TC-W3 water-cooling two-stroke-cycle gasoline engine oil was studied by using hydroisomerizing base oil.

在对加氢异构化油理化性质和对抗氧剂感受性能究的础上,并础油制了EGD冲程汽油机油和TC-W3水冲程汽油机油。

The copper ion content is determined with direct spectrophotometry after the engine oil was incinerated,dissolved with acid and developed with Neocuproin-Hydroch lorid Monohydrat.

将机油灰化、酸溶解后,新亚铜灵显色、直接光度法测定铜离子含量,样品回收率在92。