nonreturn valve 止回阀...nonreturn-to-zero change on one 逢1变化不归零制...Nonreturn to Zero 不归零制...nonreturn-to-zreo inverse 标识不归零制...nonreturn-to-zreo mark 标记不归零制...nonreturn-to-zero 不归零制...nonreturn-to-zero mark 电平不归零制...nonreturn-to-zero inverse 翻转不归零制...nonreturn-to-zero indicating 增量不归零制...
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