发布时间:2025-01-24 18:03:50
6.5钢筋每米重量是0.261公斤,8毫米钢筋每米重量是0.395公斤,所以
1000/0.261=3831米,1000/0.395=2531米
电容器当u不变时 为什么电容与正对面积无关 而当q不变时与正对面积有关
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