发布时间:2025-01-30 02:31:49
圆柱底面其实就是一个圆,假设其底面周长是C,底面半径是r
那么圆柱底面周长C=2*π*r,则,底面半径r=C÷2÷π
农村自来水山里来的,水压上不去三楼,抽上三楼水塔就脏,怎么处理
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