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The law of variable mass motion of a soft rope is studied.
研究了一种变质量柔绳上升和下降的运动规律。
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The conservation laws of relativistic variable mass systems were studied.
研究相对论性变质量系统的守恒律。
In this paper, variable mass controllable mechanical systems are investigated.
本文研究一类变质量可控力学系统。
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