发布时间:2025-02-06 14:48:27
请问DN50的管道395米,保温是25mm的橡塑换算成立方米及平方米分别是多少 ?公式是怎样的?谢谢!
DN50的管道内径是50mm,外径是60mm。保温25mm,换算成面积就是:3.14*0.06m*395m=74.418㎡。体积的计算式:3.14*0.06m*395m*0.025m=1.86
电脑椅坐上后 有一个2cm的下沉感然后离开椅子 会有上升感觉 请问这个正常吗
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