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单词 railroad jack
释义 railroad jack
noun
1. : a portable jack used for heavy lifting
2.
 a. : a 4-screw or 6-screw hoist operated by electric motors for lifting locomotives off their wheels while they are undergoing repairs
 b. : a hydraulic lift device operated either by hand lever or motor
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更新时间:2024/12/23 18:46:32