two-level optical signal 二电平光信号
In order to improve the signal noise ratio and the precision of the analysis, a "two-level sifting" is processed in recording and analyzing VLP by HOLTER.
为了提高晚电位分析结果的精确度，提高信号噪声比，在HOLTER记录和分析时，采用了“二级筛选”的设计方法。
The railway signal auto-control system is a level of power supply load, which requires two lines of high quality power supply.
铁路信号自控系统是一级供电负荷，要求有两路高质量的供电电源。
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