单项选择题
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
Saving or reducing expenditure in business is（）A.save m...
单项选择题Saving or reducing expenditure in business is（）
A.save money B.increase cost C.cost planning D.cost control
