The most useful and usual type of trains are steam trains.
A.正确
B.错误
正确答案：错误
The most useful and usual type of trains are steam trains.
3次阅读
Freight trains are very efficient, with economy of scale and high energy efficiency.
Sometimes train has been bestowed with rich feelings and spiritual significance.
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- China’s high speed trains can reach a top speed of 350 kmh.