“shell knocker”的概念、定义、翻译、参考文献-科学参考

单词	shell knocker
释义	shell knocker [`shel ´näk·ǝr] ^ENGINEERING A device to strike the external surface of a horizontally rotating process vessel (for example, a kiln or a dryer) to loosen accumulations of solid materials from the inner walls or flights of the shell. Also known as knocker.
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