The theory of life cycle of records is a records management theory that studies the whole life movement process and its inherent law from producing to destroying or keeping for ever.
文件生命周期理论是研究文件从产生到销毁或永久保存的整个生命运动过程及其内在规律的文件、档案管理理论。
This paper studies a cone with leaking as a pendulum and the period of its sand leaking movement and gives out the period changing rule of the variable mass pendulum.
本文以一个载满沙子的圆锥表漏斗作为单摆，研究沙子漏出过程的运动周期，从而给出此时变质量单摆的周期变化规律。
Through the mixing tests, the author studies the mixing property of the mixer for three - dimensional movement and analyzes its affecting factors.
通过混合试验对三维运动混合机的混合性能及其影响因素作了分析与研究。
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