Impulse, vibration and noise are ordinary troubles in hydraulic system, which is an available measure to reduce impulse noise while wave attenuator is used in the system.

液压系统的冲击、振动和噪声是系统中常见的弊端，采用消波器是减小系统冲击噪声的有效方法。

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The principles of attenuator assembly of half -wave plate and polarizers are discussed briefly.

简要论述了半波片组合衰减器的 工作原理。

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