Typo, it should be 9 meter per second.

来源: DrunkerKickass 于 2011-05-19 21:44:17 [] [旧帖] [给我悄悄话] 阅读数 : (70 bytes)
回答: 时速30公里=9公里每秒? 由 biglow 于 2011-05-19 20:47:28

bullshiting? I never heard of it, check the dictionary before posting.

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