?想?????在???是騎?,?車系統是?常??????????一?摩?皮帶??別?方法???實?們??以?用?????????現?????。?一?馬?接上???,???轉??在轉?????磁鐵??,??現??轉速???很?,當???止轉?後?磁鐵跟???不?????了?/p>
???在轉???磁鐵????以??表示??A???欲??磁鐵???轉盤??????,?????????法?第???律??產??????,???一等?磁鐵,??????????B??,???????不?轉盤快速???/p>
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Fundamentals of Physics, Halliday
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