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上海合作组织背景。

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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.

下列选项中，哪项不是脑脓肿的病因与感染途径

A. 致病菌通过直接蔓延
B. 血行感染
C. 开放性颅脑损伤
D. 不明原因
E. 机体免疫功能降低