研究具有双面理想完整约束的变质量力学系统的机械能守恒律。
The conservation law of mechanical energy in variable mass mechanical systems with ideal bilateral holonomic constraints is studied.
在人体系统变质量力学模型研究基础上，开展了人体系统变质量块体动力学研究。
On the basis of study on varing-mass mechanical model of human body system, the varing-mass block-body dynamics of human body system are developed to study.
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