(1) the system works on the menu, and the menu is redisplayed after the operation. (2) the use of documents for the preservation of information; (3) the entry of the information of the goods; (4) amend the information of the goods; (5) delete the information of the goods; (6) according to the condition (ID, name, time, etc.), the quantity of item information is counted, and the information of the goods is displayed. Note: the system automatically checks the reasonableness of all kinds of data.

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