“four-ball tester”的概念、定义、翻译、参考文献-科学参考

单词	four-ball tester
释义	four-ball tester [¦fȯr ¦bȯl `tes·tǝr] ^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	directed line directed number directed set direct effect direct electromotive force direct energy conversion direct-entry terminal direct-expansion coil direct extrusion direct-feedback system direct fire direct-fire direct-fired evaporator direct-gap semiconductor direct-geared direct grid bias direct hierarchy control direct-image offset system direct-imaging mass analyzer direct immunofluorescence direct-indicating compass direct input/output direct-insert subroutine direct instruction direct interelectrode capacitance

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