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optifdtd:最好有前后文这样才好计算 (2021-02-24 08:26) $xF[j9nM
sunguyzain:11.4 的公式錯誤了, 應該是 PI *A*sin(... 1rLxF{, PI 誤植為 4了 (2021-02-24 13:05) mQ:YHtHE.F