長度可能不是大問題，主要是落差。我有一個至少120尺到大街。落差允許的話，拐彎處90度垂直。

來源: QinHwang 於 2024-01-26 08:08:55 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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