一列长200m的火车以100km/h的速度通过1000m的隧道,这列火车完全通过隧道需要多少秒?这是一道选择题。选项中没有答案是12秒的 。A 70s;B 60s; C 50s D 30S.写出计算过程
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![一列长200m的火车以100km/h的速度通过1000m的隧道,这列火车完全通过隧道需要多少秒?这是一道选择题。选项中没有答案是12秒的 。A 70s;B 60s; C 50s D 30S.写出计算过程](/uploads/image/z/2224028-20-8.jpg?t=%E4%B8%80%E5%88%97%E9%95%BF200m%E7%9A%84%E7%81%AB%E8%BD%A6%E4%BB%A5100km%2Fh%E7%9A%84%E9%80%9F%E5%BA%A6%E9%80%9A%E8%BF%871000m%E7%9A%84%E9%9A%A7%E9%81%93%2C%E8%BF%99%E5%88%97%E7%81%AB%E8%BD%A6%E5%AE%8C%E5%85%A8%E9%80%9A%E8%BF%87%E9%9A%A7%E9%81%93%E9%9C%80%E8%A6%81%E5%A4%9A%E5%B0%91%E7%A7%92%3F%E8%BF%99%E6%98%AF%E4%B8%80%E9%81%93%E9%80%89%E6%8B%A9%E9%A2%98%E3%80%82%E9%80%89%E9%A1%B9%E4%B8%AD%E6%B2%A1%E6%9C%89%E7%AD%94%E6%A1%88%E6%98%AF12%E7%A7%92%E7%9A%84+%E3%80%82A+70s%3BB+60s%EF%BC%9B++C+50s++D+30S.%E5%86%99%E5%87%BA%E8%AE%A1%E7%AE%97%E8%BF%87%E7%A8%8B)
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