测平均速度用什么工具计时?
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![测平均速度用什么工具计时?](/uploads/image/z/11153332-28-2.jpg?t=%E6%B5%8B%E5%B9%B3%E5%9D%87%E9%80%9F%E5%BA%A6%E7%94%A8%E4%BB%80%E4%B9%88%E5%B7%A5%E5%85%B7%E8%AE%A1%E6%97%B6%3F)
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