| 单词 |
four-ball tester |
| 释义 |
four-ball tester four-ball tester[¦fȯr ¦bȯl ′tes·tər] (engineering) A machine designed to measure the efficiency of lubricants by driving one ball against three stationary balls clamped together in a cup filled with the lubricant; performance is evaluated by measuring wear-scar diameters on the stationary balls. |
| 随便看 |
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