电线的粗细型号怎么看？16个平方的线是什么，怎么看？ 16平方毫米的电线多粗怎么算
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\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\uff1a
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16=0.25\u00d73.14\u00d7d²
d²=16\u00f70.25\u00f73.14
d=\u221a\uff0816\u00f70.25\u00f73.14\uff09=4.51466\uff08\u6beb\u7c73\uff09
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圆的面积是：π乘以半径的平方
16平的线就是16平方毫米的线
除以π，就是线的直径
16平方的线直径为=16/3.14=5.1mm
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