A题　多功能电子计价秤制作　　能用键盘设置单价，称重后能同时显示重量、单价和总额；
电子计价秤：最大称重为15.000公斤，重量误差不大于,A title can be multi-functional keyboard电子计价秤production unit set up, after weighing at the same time show the weight, unit price and total amount 电子计价秤: for the largest weighing 15.000 kilograms, the weight of error of not more than