而后求出了系统固有频率的近似解析公式，同时也得到了极限流速的近似解析公式。
Then approximate analytic formula of system frequency are obtained. Meanwhile, approximate analytic formulation of limit velocity is obtained.
而后求出了系统固有频率的近似解析公式，同时也得到了极限流速的近似解析公式。
Then approximate analytic formula of system frequency are obtained. Meanwhile, approximate analytic formulation of limit velocity is obtained.
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