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    <title>NEC 310 规范 on 电气工具箱</title>
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      <title>电线选型计算器 — NEC AWG &amp; kcmil 规格速算</title>
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      <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
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      <description>免费 NEC 规范电线选型计算器。输入电流 A、电压 V、敷设距离与导线材质,秒出 AWG/kcmil 规格与载流量,含 75°C 修正与 NEC 310.15(B) 温度系数。不需注册,直接使用。</description>
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