每小时由一个数字打印机记录一次输出信号。
Output signals are recorded by a digital printer every hour .
每小时由一个数字打印机记录一次输出信号。
Output signals are recorded by a digital printer every hour.
此系统由程序接触器、自制的时刻比对自动转换器、时间间隔计数器和数字打印机组成。
The system consists of a programme contactor, a automatic transfer device which was completely designed and built by ourselves, a time interval counter and a digital recoder.
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