What do we know about the first of t - 考试宝

单选题 What do we know about the first of the Chinese high-speed trains?

A、 It operated at the top speed of 200km/h.

B、 It rolled off the assembly line in 2007.

C、 It ran for the distance about 3,000km.

D、 It was designed for the mild winter.

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A、Scientific value.

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