管子和接頭都可能有局部突起，先把表麵全都用砂紙磨毛糙，然後推進的同時左右小幅度轉動，就比較容易看到磨亮的接觸點。

來源: Shubin 於 2025-06-01 11:41:54 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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