发布时间:2025-02-01 07:44:13
你把桥墩的柱子用纸张折成三角状,这个桥柱子从侧面看应该是个梯形,因为
桥墩的最大承重力就应该是个三角状,柱子最下面接地面的横截面越宽,桥墩的承重力就越大,梯形越高,柱子底下接地面的就要越宽越好,这样做的话,应该就可以了望
我的云内4102普机发动机一般是5000公里换一次机油空气滤芯器半个月换一次为什么干燥器还会
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