The paper studied the characteristic of structure of ancient brick and rock pagoda, proposed the formula of self vibration period for ancient pagoda.
研究了砖石古塔的结构特性，提出了对古塔自振周期的计算公式。
The vibration characteristic of loudspeakers is investigated experimentally, based on the self-mixing interference effect of semiconductor laser diode.
基于半导体激光器的自混合干涉效应，通过实验研究了扬声器的振动特性。
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