哈哈，這是靜力學分析，有重力，有支撐力，有摩檫力。離工程還差的遠呢。

來源: freemanli01 於 2022-01-03 12:06:59 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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