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【单选题】
关于UPC码的描述，错误的是
A.
UPC-A码的使用对象是通用商品，它的字符长度是10
B.
UPC-E码是商品短码，其字符长度是6，主要适用于印制面积较小的商品上面
C.
UPC-B码是通用商品的加长码
D.
UPC-C和D码主要应用于生产加工及仓库流通流域
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