单项选择题
A.Joint Distribution B.United Distribution C.Multiple Delivery D.Joint Delivery
（）is not a physical wall, but a lot of virtual data to ...
单项选择题（）is not a physical wall, but a lot of virtual data to protect the computer network.
A.Data wall B.Data Channel C.Data base D.firewall
（） is meant to provide facility for customer’s need or ...
单项选择题（） is meant to provide facility for customer’s need or inquiry and arrange it.
A.Service B.business C.customer service D.making money
Saving or reducing expenditure in business is （） A....
单项选择题Saving or reducing expenditure in business is （）
A.Save money B.Increase cost C.cost planning D.cost control
