单项选择题
A.packaging B.special packaging C.green packaging D.vacuum packaging
（）is the way to deliver goods for different shippers in...
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 deliveries D.joint delivery
（）is not a physical wall but a flow virtual data to pro...
单项选择题（）is not a physical wall but a flow virtual data to protect the computer network.
A.data wall B.data channel C.database D.firewall
（）means to provide facility for customer’s need or inqu...
单项选择题（）means to provide facility for customer’s need or inquiry and arrange it.
A.service B.business C.customer service D.making money
