“bull wheel”的概念、定义、翻译、参考文献-科学参考

单词	bull wheel
释义	bull wheel [`bǝl ´wēl] ^{MECHANICAL ENGINEERING} 1. The main wheel or gear of a machine, which is usually the largest and strongest. 2. A cylinder which has a rope wound about it for lifting or hauling. 3. A wheel attached to the base of a derrick boom which swings the derrick in a vertical plane.
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