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單項(xiàng)選擇題

（）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

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單項(xiàng)選擇題

（）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

單項(xiàng)選擇題

（）means to provide facility for customer’s need or inquiry and arrange it.

A.service
B.business
C.customer service
D.making money