單項(xiàng)選擇題

Pipelines are not （）

A.Labor-intensive
B.capital-intensive
C.tech-intensive
D.Low cost and high return

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單項(xiàng)選擇題

The large market share of transportation in China is （）transport.

A.air
B.rail
C.truck
D.pipeline

單項(xiàng)選擇題

There is no difference between the environmental logistics and （）one.

A.white
B.red
C.blue
D.green