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並前往https://books.google.com.tw/books?id=jxY1AQAAIAAJ&pg=PA879&lpg=PA879&dq=gravity%E6%8E%A8%E8%BB%8A&source=bl&ots=Rdiyja84y7&sig=ACfU3U2kbuFiJHPz32aHKnNwcOeb53Uujw&hl=zh-TW&sa=X&ved=2ahUKEwjAotSF0ZX1AhXjQ98KHU7TANEQ6AF6BAgWEAM

The Railway News ... - 第 102 卷 - 第 879 頁 - Google 圖書結果

... usually under the drag box , and projects to within 2 } in . above rail level , in which position it is held by gravity assisted by a spring .

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