单项选择题
（） is not a physical wall, but a lot of virtual data to protect the computer network.
A. Date wall
B. Date channel
C. Database
D. Firewall
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相关考题
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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 -
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
Re-handling can save cost and improve service, Is it true or not? （）
A. Wrong
B. Not total true
C. True
D. Not clear here
