Its lubrication properties in water were evaluated using a four-ball machine.
利用四球试验机考察了水溶性抗磨剂在水中的润滑性能。
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。
The tribological behaviors of the synthetic benzotriazole derivatives as additives in liquid paraffin were evaluated with a four-ball machine.
利用四球试验机考察了其在液体石蜡中的最大无卡咬负荷值。
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