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邮电部关于信件和其他具有信件性质的物品的规定信件包括信函和明信片。信函是指以套封形式传递的绒封的信息的载体，具体内容包括：（１）书信；（２）各类文件；（３）各类单据。证件；（４）各类通知；（５）有价证券。明信片是指裸露寄递的卡片形式的信息载体。具有信...
The Ministry of Posts and Telecommunication requirements letters on letters and other items of a letter nature include letters and postcards. Letters refer to the carrier of the velvet message delivered in the form of a sleeve seal. The specific contents include: (1) correspondence; (2) various documents; and (3) various types of documents. Documents; (4) various types of notice; (5) securities. Postcard refers to the bare delivery of the card form of information carrier. With letter ...