《认识千米》名师精讲https://v.qq.com/txp/iframe/player.html?vid=e1414x78vvn&width=500&height=375&auto=0用列表法解决问题https://v.qq.com/txp/iframe/player.html?vid=f1414tbq3zn&width=500&height=375&auto=0
千米和米的单位换算https://v.qq.com/txp/iframe/player.html?vid=m1414hw9w45&width=500&height=375&auto=0
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