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单词 fourfold purchase
释义 fourfold purchase
 a tackle that is composed of a rope passed through two fourfold blocks in such a way as to provide mechanical power in the ratio of 1 to 5 or 1 to 4, depending on whether hauling is done on the running or the standing block and without considering friction. Cf. tackle (def. 2).
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更新时间:2024/12/23 14:10:11