6.一隊(duì)伍長(zhǎng)50m.跑步速度2.5m/s.完全通過長(zhǎng)100m的大橋.共需時(shí)間 s. 查看更多

 

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一列隊(duì)伍長(zhǎng)50m,行進(jìn)速度2.5m/s,經(jīng)過一座100m的涵洞,當(dāng)隊(duì)伍全部通過涵洞需要用時(shí)多少秒?

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一列隊(duì)伍長(zhǎng)50m,行進(jìn)速度2.5m/s,經(jīng)過一座100m的涵洞,當(dāng)隊(duì)伍全部通過涵洞需要用時(shí)多少秒?

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一列隊(duì)伍長(zhǎng)50m,行進(jìn)速度2.5m/s,經(jīng)過一座100m的涵洞,當(dāng)隊(duì)伍全部通過涵洞需要用時(shí)多少秒?

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一列隊(duì)伍長(zhǎng)50m,行進(jìn)速度2.5m/s,經(jīng)過一座100m的涵洞,當(dāng)隊(duì)伍全部通過涵洞需要用時(shí)多少秒?

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一列隊(duì)伍長(zhǎng)50m,跑步速度是2.5m/s,隊(duì)伍全部通過一長(zhǎng)100m的涵洞,需要的時(shí)間是(  )

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