发布时间:2025-02-04 19:04:50
水槽体积为4000立方厘米,流量为30x3.14=94.2平方厘米,装满水槽所需时间=4000/94.2=42.5s<50s 所以可以装满
桶装水在中等地级市的前景及什么品牌什么规格生产线最能保证品质
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