英语词汇“spiral ramp system”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	spiral ramp system
释义	spiral ramp system spiral ramp system [′spī·rəl ′ramp ‚sis·təm] (mining engineering) Development of a mine by driving moderately inclined haulageways from the surface to underground ore horizons.
随便看	efdsl efdss efdsw efdt efdu efdv efe efea efeac efeal efeb efec efecot efectin efecw efed efeda e-federation efedrin efedrine efee efees efef efeh efei

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