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
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相关考题
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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 -
单项选择题
Saving or reducing expenditure in business is（）
A.save money
B.increase cost
C.cost planning
D.cost control -
单项选择题
（）is guaranteed by the full market supply and just-in-time logistics.
A.zero inventory
B.stock
C.inventory
D.outsourcing inventory
