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According to the passage, when could people start using a maglev commercially7A．In 5 years

According to the passage, when could people start using a maglev commercially7

A．In 5 years.

B．In 10 years.

C．In 20 years.

D．In more than 20 years.

提问人：网友ruankao4 发布时间：2022-01-06

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