正确答案: D

Firewall

题目：（） is not a physical wall, but a lot of virtual data to protect the computer network.

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学习资料的答案和解析：

[单选题]Developed countries, like the US, have moved the some manufactures to the developing countries. Is it true or not? （）

Yes

[单选题]The integrated logistics activities, equipment and information network, and so on, is called （）

logistics integration

[单选题]（）is one of functions in logistics, which can deliver goods to customer directly by order in the most economic way.

Transportation

[单选题]How many categories are there inwater transport?（）

4

[单选题]What are transported mainly by water?（）

Heavy, bulky and low value commodities

[单选题]（）links all suppliers and customers as a chain in a certain product and service.

supply chain

解析：中文：在一定的产品当中把所有供应商和客户连接起来就称为供应链。

[单选题]CRM的中文意思是（）。

客户关系管理