印钞厂在印刷钞票时,不可避免会有个别钞票出现印刷缺陷。这样的残次品钞票不能发行出去,质检发现后,要把它抽出来销毁。这样,原本号码连续的钞票中,就会出现“断号”的现象。为了把空缺补齐,使成批钞票的总数不减少,印钞厂会另外印刷一批质量合格的钞票,采用专门的冠字字母,作为“补号券”备用。一旦发现质量不合格的次品,就抽出来销毁,同时 Banknote printing banknote printing, inevitably there will be individual banknote printing defects. Such a defective defective banknotes can not be issued, after the quality inspection is found, it should be taken out to destroy. In this way, the original number of consecutive banknotes, there will be “broken number ” phenomenon. In order to fill the vacancies so that the total number of banknotes does not decrease, the banknote printing factory will additionally print a batch of banknotes of acceptable quality using a special crest letter as a spare code. Once found substandard quality substandard, it is extracted to destroy, at the same time