The system is doubly-fed generator rotor side converter control circuit, although not perfect, there must be reference value.

该系统是双馈发电机转子侧的变流器控制电路，虽然不是很完善，有一定得参考价值。

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Some contents in the paper have reference value for frequency shaping circuit in seismic data acquisition system.

有关内容对量化前频谱整形均衡器的设计具有一定的参考价值。

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This system can measure the concentration of H2S in air. When the measured value is greater than the reference value, the alarming circuit will work. Then the hazard of danger will be decreased.

系统可以检测出空气中硫化氢气体的浓度，并且当测量值超出预设报警限时可以发出声光报警信号，提示现场工作人员采取紧急措施，减小中毒事故的发生率。

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