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准时制物流配送一般不随意改变配送时间，但往往需要根据客户的具体需求更改配送的品种。()

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上海合作组织背景。

EC means using simple, fast and low-cost electronic communications to transact, without face-to-face meeting between the two parties of the transaction.()

认证机构就是承担安全电子交易认证服务，签发数字证书，并能确认用户身份的服务机构。()

Three American psychologists did a research study several years ago on what Americans value most. In the study, eighteen values were asked to put in the order of importance.