On-site operation test shows that the research oil has an evident edge over the original hydraulic transmissionoil.
在现场运行试验中，研制油的性能比参比油有显著提高。
2
Thus, it seems, the exploitation of crude oil, transmissionoil industry all over the world are facing major problems.
因此看来，原油的开采、输送是全世界石油行业所面临的重大问题。
3
Due to the need of hydraulic transmissionoil source, the structure is relatively large and complex, and there is a certain pollution to the environment.