按其功能分类 为选择信号（Selective Information or Address Signals）、监视信号（Supervisory Signals）、计费信号（Charging Information）及可闻信号音（Audible Tone Signals） 等。
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通过监视信号波形的参数的时间变动，能够监视服用物质给血中成分浓度或血流量带来的影响。
Influence of an intake substance upon blood component concentrations and blood flow can be monitored by monitoring the time curves of parameters of the signal waveform.
最终查出造成机组事故的根本原因是可控硅励磁装置供电电源无工作状态监视信号及故障报警信号；
The final basic cause that resulted in the failure is no working state monitoring signal and failure warning signal of power supply source of controlled silicon excitation device.
当 VBAT 超出其工作范围时，将监视电池输入并激活故障信号。
Battery input is monitored and a fault signal becomes active when VBAT is out of its operative range.
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