A calibration valve oil for hydraulic shield safety valves was formulated by a base oilobtalned from the distillate of a deep-refining paraffinic crude with qualified additives.

以深度精制的石蜡基馏分油为基础油，添加具有改善油品性能的添加剂研制了液压支架安全阀校阀油。

youdao

The Bearing oil L-FD68 were formulated from base oil obtained by deep-refining paraffinic crude and doped with various additives.

以深度精制的石蜡基馏分油为基础油，添加了各种添加剂，制备了轴承油l - FD68。

youdao

Normally, refined vacuum distillates of paraffinic Daqing crude oil are used as base stocks and are packaged with composite additives.

该油以大庆原油正常精制的减压馏分油为基础油，添加复合添加剂而成。

youdao