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穀堆底面半徑=18.84÷3.14÷2=3(米) 穀堆體積=3.14×3²;×1=28.26(立方米) 糧囤底面積=3.14×2²;=12.56(平方米) 可以堆的高度=28.26÷12.56=2.25(米)
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