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According to the passage when could people st

2022-08-06 16:23:34 问答库 阅读 180 次

问题详情

According to the passage, when could people start using a maglev commerciaily？A.In 5 years. B.In 10 years.C.In 20 years.D.In more than 20 years.

参考答案

正确答案：B
B

考点：