英语词汇“boom dog”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	boom dog
释义	boom dog boom dog [′büm ‚dȯg] (mechanical engineering) A ratchet device installed on a crane to prevent the boom of the crane from being lowered but permitting it to be raised. Also known as boom ratchet.
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