用參數方程簡單明了：x=acost, y=asint, z=bt，點在xy平麵上作圓周運動，沿軸向（z）作勻速直線運動。

來源: Hansha 於 2023-07-06 09:37:41 [舊帖] [給我悄悄話] 本文已被閱讀：次

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