单词	permanent paper
释义	permanent paper 有永久保存价值的文件
随便看	polarity-chronologic unit polarity chronology polarity coil polarity coincidence array polarity-coincidence correlation Polarity Coincidence Correlation Receiver polarity coincidence correlator polarity-coincidence correlator polarity coincidency correlator polarity comparison polarity control polarity conversion polarity converter polarity correlation polarity correlator polarity curve polarity dating polarity decision polarity decision phase detection polarity-dependent frequency shift polarity detection polarity detector polarity device polarity directional relay polarity-directional relay