快速赚钱
假设在冰面上卡刃, 不打滑. ski既没有横向位移,也没有转动位移, 就是说不耗能. 结果就是越来越快, 一直快到风阻成为主要耗能方式.
jluo 发表于 2013-2-18 14:07
depends on the rates, the conversion is never perfect, and the loss may be large sometimes.
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