Testing of lubricants ; testing by the shell four - ball tester ; determination of welding load of consistent lubricants 润滑剂检验.用壳牌公司的四球试验仪检验.润滑脂焊接
2.
Testing of lubricants ; testing by the shell four - ball tester ; determination of wear characteristics for consistent lubricants 润滑剂检验.用壳牌公司的四球试验仪检验.润滑脂磨损