发布时间:2025-02-01 03:03:05
导线截面积s=I/a。I表示电流安,a表示每平方安全承载电流安。铜线a取每平方8安,铝线4安。比如100安的电流,铜线s=100÷8=12.5平方,铝线s=100÷4=25平方。
哪些物体是梯形三角形正方形菱形圆柱体每种形状要写出5个 跪求
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