桥梁结构的动力特性就是结构振动的基本特性，是对桥梁结构进行地震反应分析的基础。
Dynamic characteristics of bridge structure is the foundation of seismic response analysis of bridge structures.
最终分析出发动机壳体的振动噪声特性。
Finally, acquaints the vibration and noise characteristic of the engine shell.
最终分析出发动机壳体的振动噪声特性。
Finally, acquaints the vibration and noise characteristic of the engine shell.
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