“roof bolt”的概念、定义、翻译、参考文献-科学参考

单词	roof bolt
释义	roof bolt [`rüf ´bōlt] ^{MINING ENGINEERING} One of the long steel bolts driven into walls or roofs of underground excavations to strengthen the pinning of rock strata.
随便看	saussurite saussuritization sauterelle Savage principle savane armée savane épineuse savanna savanna climate savanna-woodland savart Savart plate Savart polariscope savic orogeny savin oil Savonius rotor Savonius windmill savory savory oil SAW saw saw bit saw-cut sawdust sawdust concrete sawfish

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