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16平的纯铜线和25的钢筋对比,哪个电阻更小? |
发表于 2015-5-29 14:04:30
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发表于 2015-5-29 14:06:42
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发表于 2015-5-29 14:26:02
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发表于 2015-5-29 14:58:55
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发表于 2015-5-29 15:00:32
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