短語詞組短語momentum m conservation law 動量守恒定律momentum m conservation 動量守恒momentum conservation equation 動量守恒方程;動量守恒方程為angular -momentum conservation 角動量守恒energy and momentum conservation 能量和動量守恒electric momentum conservation 電動量守恒momentum conservation principle 動量守恒原理momentum conservation theory 動量守恒定律energy momentum conservation 能量動量守恒 返回 momentum conservation