英语词汇“four-ball tester”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

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.
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