Its lubrication properties in water were evaluated using a four-ballmachine.
利用四球试验机考察了水溶性抗磨剂在水中的润滑性能。
2
FST production of various series of angular contact ball bearings, rolling mill also produced a four-point contact ball bearings and machine tools combined angular contact ball bearings.
FST生产各种系列的角接触球轴承，同时还生产轧机用四点接触球轴承及机床用组合角接触球轴承。
3
The tribological behaviors of the synthetic benzotriazole derivatives as additives in liquid paraffin were evaluated with a four-ballmachine.