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单选题 Why do we call rail transport is a "green" system

A. Because its consumption of energy per unit per km is lower than road modes

B. Because its consumption of energy per unit per km is lower than air modes

C. Because its consumption of energy per unit per km is lower than sea modes

D. Because its consumption of energy per unit per km is lower than pipe modes

大学英语(卓越英语)课程封面

学科:大学英语(卓越英语)

时间:2025-09-20 00:04:16

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