Freight trains are very efficient, with economy of scale and high energy efficiency._精华吧

Freight trains are very efficient, with economy of scale and high energy efficiency.

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Freight trains are very efficient, with economy of scale and high energy efficiency.

A.正确

B.错误

正确答案：正确

Tag：中外铁路文化之旅时间：2022-01-14 21:30:18

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