隻要在管道任一處檢查到管道是真空的，那整條管道就是真空的，但如果管道發生泄漏，要查泄漏點就困難些

來源: 競選於 2016-04-09 20:53:54 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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