单项选择题
（）is the way to deliver goods for different shippers in the same truck, by the most economic route.
A.Joint Distribution B.United Distribution C.Multiple Delivery D.Joint Delivery
单项选择题 （）is not a physical wall, but a lot of virtual data to protect the computer network.
单项选择题 （） is meant to provide facility for customer’s need or inquiry and arrange it.
单项选择题 Saving or reducing expenditure in business is （）
