“reversible-pitch propeller”的概念、定义、翻译、参考文献-科学参考

单词	reversible-pitch propeller
释义	reversible-pitch propeller [ri`vǝr·sǝ·bǝl ¦pich prǝ`pel·ǝr] ^{MECHANICAL ENGINEERING} A type of controllable-pitch propeller; of either controllable or constant speed, it has provisions for reducing the pitch to and beyond the zero value, to the negative pitch range.
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