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並前往https://books.google.com.tw/books?id=RWQrAQAAMAAJ&pg=PA10-IA51&lpg=PA10-IA51&dq=6+inch+drain+cover&source=bl&ots=DnKPHcO-2j&sig=ACfU3U13OW6CteqxYS7B9QFbxssGSJ4-PA&hl=zh-TW&sa=X&ved=2ahUKEwjPtML1mvmAAxX-3gIHHS_DDRIQ6AF6BQiFAxAD

Air Force Manual - 第 14-18 卷﹔第 67 卷 - 第 10 頁 - Google 圖書結果

( 3 ) A skeleton frame to cover stacks may be constructed of 2 by 6 inch or 4 by 4 inch lumber ... Puddles on tarpaulins tend to break through and drain .

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