“prop-crib timbering”的概念、定义、翻译、参考文献-科学参考

单词	prop-crib timbering
释义	prop-crib timbering [`präp ´krib `tim·bǝ·riŋ] ^{MINING ENGINEERING} Shaft timbering with cribs kept apart at the proper distance by means of props.
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