弹簧摆
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a spring pendulum
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Based on the mass-period method, a measuring device named double spring inversion pendulum was designed, which could measure the center of mass and moment of inertia of an engine.
基于振动系统质量周期法，设计了一种测试发动机质量参数的双簧倒立摆试验台。
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