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。
In addition, the tribological properties of nanocrystalline Pb powders were tested with a four-ball machine.
另外，在四球试验机上考察了铅纳米晶的摩擦学性能。
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。
The four-ball machine test showed that the suspension possessed good extreme pressure performance and common antiwear performance; and had no effect on the friction coefficient by the MTM test.
四球试验结果表明，该悬浮液具有较好的极压性能，抗磨性能一般，MTM试验显示该悬浮液对摩擦系数影响不大。
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。
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。
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