对所有的回热式低温制冷机，压力波与质量流之间的相位控制是达到制冷效果的关键。
To all the regenerative refrigerators, to control the phase angle between the pressure and the volumetric velocity is pivotal to attaining satisfactory refrigeration effect.
了解电声器件的相位特性对有源消声控制器的设计及消声效果分析具有重要作用。
It is important to understand the phase characteristics of electro-acoustic device for the design and effect analysis of active noise cancellation controller.
相位设计是信号控制交叉口进行配时设计时需要首先解决的问题，直接决定着控制方案的效果。
The phase design of intersection signal control is the first problem to solve in intersection automation design, directly affecting the control project.
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