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並前往https://books.google.com.tw/books?id=fsxGAQAAMAAJ&pg=RA3-PA87&lpg=RA3-PA87&dq=18+inches+to+cm&source=bl&ots=-CP9vNQjeX&sig=ACfU3U0GJP4tdZqXLD8_sBAI4MVyQ2NoZw&hl=zh-TW&sa=X&ved=2ahUKEwjyvrii77n0AhXQilwKHTtTBYIQ6AF6BAgQEAM

Bulletin - 第 87 頁 - Google 圖書結果

... propagation of flame in a tube 1 inch in diameter and 18 inches in length ... 5 cm . in diameter , open at the firing end , are 3.45 and 18.1 percent .

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