[单选题]What kind of products do the air carriers deliver? （）

正确答案 ：C

A and B

[单选题]（） is not a physical wall, but a lot of virtual data to protect the computer network.

正确答案 ：D

Firewall

[单选题]（）is software about the relation between the customer and the supplier in marketing.

正确答案 ：A

Customer Relationship Management

[单选题]ASRS (Automated Storage and Retrieval System) is（）

正确答案 ：A

自动化存取系统

[单选题]（）is used to protect goods not to be deteriorated like food and medicine.

正确答案 ：C

Vacuum packaging

解析：中文：真空包装可防止物品不变坏，包括食品和药品。

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