單項選擇題

Pipelines are not （）

A. labor-intensive
B. capital-intensive
C. tech-intensive
D. low cost and high return

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單項選擇題

The large market share in china’s transportation is （）transport.

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

單項選擇題

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

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