UID︰13032
引用第31樓國球旗於2010-04-16 01:02發表的“”:一個好友論壇,只得一個 yan 姐 [表情] [表情]
UID︰8303
引用第1樓卡卡....於2011-03-10 02:14發表的“”:solid?圖中potential=0 個point 咪PE =0 [表情] work done in bringing the particle from infinity to that pt is 0 最低potential 個point,at equilibrium ,net force=0 [表情]