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單項(xiàng)選擇題

（）is to protect goods not to be deteriorated like for and medicine.

A.packaging
B.special packaging
C.green packaging
D.vacuum packaging

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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

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

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