C2B is the r（） of the traditional e-commerce model of B2C.（an exchange of positions or functions）
正确答案：reversal
C2B is the r（） of the traditional e-commerce model of B2C.（an exchange of positions or functions）
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The main differences between e-commerce and m-commerce are m（）, location tracking and security.（the ability to move or travel ar
Effective l（） is the key to a successful e-commerce business.（the business of transporting and delivering goods）
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