The code is called the Universal Product Code (UPC). It is designed to add speed and efficiency to stores by using computers. It can do this in several ways. First, it is not necessary for workers to put individual prices on items. Errors in prices are eliminated, or done away with. Also, the time spent checking out is reduced. UPC gives an itemized receipt to the customer with all the items, prices, and totals. The store clerk does not need to spend time checking the price on the item and punching it into cash register. This UPC computerized system will probably save as much as 45 percent of the checkout clerk's time.
What do the stripes mean? How does the computer interpret the stripes? The number printed below the vertical bars identifies the manufacturer and the manufacturer's item. As many as 10 trillion individual machinereadable numbers can be used with this system.
Codes are scanned by ______.
A.the checkout clerk
B.the customers themselves.
C.a laser beam of light.
D.the cash register.
第1题
以下哪个不是决定局域网特性的要素?()
A.传输介质
B.介质访问控制方法
C.网络拓扑
D.网络应用
第2题
以下哪个不是决定局域网特性的要素()。
A.传输介质
B.网络拓扑
C.介质访问控制方法
D.网络应用
第3题
以下哪个不是决定局域网特性的要素?()
A.传输介质
B.介质访问控制方法
C.网络拓扑
D.网络应用
第4题
以下哪个不是决定局域网特性的要素?()
A)传输介质
B)介质访问控制方法
C)网络拓扑
D)网络应用
第7题
以下哪个不是决定局域网特性的要素?()
A)传输介质
B)介质访问控制方法
C)网络拓扑
D)网络应用
第8题
(17 )下列哪个不是决定局域网特性的要素 ? ()
A )传输介质
B )网络拓扑
C )介质访问控制方法
D )网络应用
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