发布时间:2025-02-01 02:55:41
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。
2299元bose耳机国内维修一口价1800元为何国外能免费换新
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