Contributes to a research on the vibration radiation noise of piezoelectric pump. Two theory models are introduced, which calculate the synthetic sound pressure according to the vibration quantity.
研究压电泵振动放射噪声，提出两种由振动量计算压电泵合成声压的理论模型。
In chapter Two, theory of Skin Effect is analyzed.
第二章是对集肤效应原理的分析。
第二部分：概念论。
Chapter two (Theory of standard regulation) briefly expatiates the definition of standard and standardization, and also the categories of them, reasonably makes the definition of standard regulation.
第二章(标准管制理论)，简述了标准、标准化的定义以及分类，并合理的界定了标准管制的定义。
Chapter two (Theory of standard regulation) briefly expatiates the definition of standard and standardization, and also the categories of them, reasonably makes the definition of standard regulation.
第二章(标准管制理论)，简述了标准、标准化的定义以及分类，并合理的界定了标准管制的定义。
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