多年来，叶轮式流量计在许多领域得到了较多的实际应用，其工作原理比较简单，概括的讲就是应用流体动量矩原理测量流量的装置。
Impeller-type flowmeter in the years of practical application, its working principle is relatively simple, general talk about is the principle of angular momentum of fluid flow measuring device.
利用动量矩守恒原理导出带太阳阵航天器的动力方程，指出了系统的非完整约束性质。
The equation of a spacecraft with solar arrays are obtained by using the conservation principle of momentum .
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