“tractor drill”的概念、定义、翻译、参考文献-科学参考

单词	tractor drill
释义	tractor drill [`trak·tǝr ¦dril] ^{MECHANICAL ENGINEERING} A drill having a crawler mounting to support the feed-guide bar on an extendable arm.
随便看	ball breaker ball burnishing ball bushing ball catch ball check valve ball clay ball coal ball float ball-float liquid-level meter ball grinder ballhead ball ice Balling hydrometer balling-up ballistic area ballistic body ballistic camera ballistic case ballistic coefficient ballistic conditions ballistic correction ballistic curve ballistic deflection ballistic density ballistic efficiency

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