In order to improve the ringing method of telephone used in power systems, a type of selective calling device using audio frequency has been developed.
为了使电力系统通信设备的呼叫装置更加使用方便工作可靠，我们研制了以按键电话机发出双音频呼叫信号进行选择接收的音频选号装置。
The paper puts forward the Probability Statistic Method of Evaluation Efficiency of an Earthquake Prediction (" Ringing-circle "Model).
该文提出了评价一次地震预报有效性的概率统计法(套圈模型)。
The modulus controlling system can insure stabilization of raw meal modulus and benefit avoidance coating and ringing but conventional method couldn't.
而采用生料率值控制系统则可确保出磨生料率值的稳定，为避免结窑、结圈创造条件。
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