正确答案: D

firewall

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

解析：中文：防火墙不是一个实际的墙，它是利用一些虚拟的数据来保护电脑。

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学习资料的答案和解析：

[单选题]（） are activities that manage the space needed to hold the inventories.

Warehousing and storage

[单选题]Organizations are now extending their （） beyond the end customer to include the acceptance and disassembly of final products for reuse in the new products.

Internal functions

[单选题]How long the haul for international deep-sea movement usually? （）

Thousands of kilometers

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

logistics integration

[单选题]How many stages in the processing of logistics integration?（）

Four