永磁电动机本质上是一种含脉动激励的对称机构，将不可避免地产生振动和噪声，影响了电动机的性能。
Permanent magnet motor is essentially symmetrical structure with pulse excitation, so it inevitably has vibration and noise, which affects performance of the motor.
本文对机构学中对称连杆曲线的FFT分析和综合方法进行了研究。
This paper studies the FFT analysis and the synthesis method of the symmetric coupler curves in mechanism.
由于信息不对称，风险投资管理机构存在很大的道德风险。
Because of information asymmetry, investment agency of venture capital has very large moral risk.
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