英语词汇“reaction ring”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	reaction ring
释义	reaction ring noun : a heavy internal cast-iron flange set in cement and used to resist the thrust of the jacks when sinking a shaft by a process in which a continuous casing is forced downward as the excavation progresses
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