“Jeffrey single-roll crusher”的概念、定义、翻译、参考文献-科学参考

单词	Jeffrey single-roll crusher
释义	Jeffrey single-roll crusher [`jef·rē ¦siŋ·gǝl ´rōl ´krǝsh·ǝr] ^{MINING ENGINEERING} A simple type of crusher for coal, with a drum to which are bolted toothed segments designed to grip the coal, thus forcing it down into the crushing opening.
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