水的阻力大約等於空氣阻力的幾倍?? - 健身
By Skylar Davis
at 2009-11-02T00:00
at 2009-11-02T00:00
Table of Contents
請問一下水的阻力大概是空氣的幾倍??如果在水中游100公尺的話,大概是在陸地上跑幾公尺???
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健身
All Comments
By George
at 2009-11-04T21:42
at 2009-11-04T21:42
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