請教一下，導流用的管子內徑有多大？先謝了。

來源: just4fun2007 於 2015-09-29 22:11:45 [舊帖] [給我悄悄話] 本文已被閱讀：次

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請教一下，導流用的管子內徑有多大？ 先謝了。