五层25间房，每间房间拉网线，请问用什么办法最省时省料呢？可不可以一层一条线再分呢？
\u51fa\u79df\u5c4b\u88c5\u7f51\u7ebf\uff0c\u4e00\u680b6\u5c42\u7684\u51fa\u79df\u5c4b\uff0c\u6bcf\u5c428\u95f4\u623f\uff0c\u8981\u6bcf\u95f4\u623f\u62c9\u7f51\u7ebf\uff0c\u8981\u600e\u4e48\u6837\u62c9\uff1f\u662f\u4e70\u4e2a8\u53e3\u7684\u8def\u7531\u5668\uff0c\u5206\u7ed96\u5c42\uff0c\u7136\u6b63\u786e\u7684\u8bbe\u5907:\u673a\u623f1\u4e2a\u53ef\u4e25\u683c\u7ba1\u7406\u4e0a\u7f51\u884c\u4e3a\u7684\u8def\u7531\u5668\u548c\u4e00\u4e2a12\u53e3\u4ea4\u6362\u673a,\u6bcf\u5c421\u4e2a12\u53e3\u4ea4\u6362\u673a(\u653e\u7f6e\u5728\u6bcf\u5c42\u697c\u7684\u4e2d\u95f4\u4f4d\u7f6e,\u8fd9\u6837\u7684\u5e03\u5c40\u6700\u7701\u7ebf).\u8fd9\u6837\u5171\u9700\u8981\u4e00\u4e2a\u8def\u7531\u5668\u548c7\u4e2a\u4ea4\u6362\u673a.\u5982\u679c12\u53e3\u4ea4\u6362\u673a\u4e70\u4e0d\u523016\u53e3\u4e5f\u53ef,\u53cd\u6b63100\u591a\u5143\u4e00\u4e2a\u4e5f\u4e0d\u8d35.
\u8def\u7531\u5668\u51e0\u4e2a\u4e0b\u8fde\u53e3\u5e76\u4e0d\u91cd\u8981,\u53ea\u8981\u67091\u4e2aLAN\u53e3\u8fde\u63a5\u4e3b\u4ea4\u6362\u673a\u5373\u53ef,\u7136\u540e\u4e3b\u4ea4\u6362\u673a\u518d\u8fde\u63a5\u5404\u697c\u5c42\u4ea4\u6362\u673a.
\u5efa\u8bae\u8def\u7531\u5668\u8d2d\u4e70\u7f51\u5427\u4e13\u7528\u7684\u53ef\u4e25\u683c\u7ba1\u63a7\u4e0a\u7f51\u884c\u4e3a\u7684\u8def\u7531\u5668: \u5982\u98de\u9c7c\u661fVR4600,\u53ef\u6700\u591a\u6269\u5c55\u52304\u8defWAN\u5bbd\u5e26\u63a5\u5165(\u5982\u6bcf\u6761\u5bbd\u5e2620M,\u52194\u8def\u53ef\u8fbe\u523080M\u603b\u5e26\u5bbd),\u800c\u4e14\u652f\u6301\u5ba2\u6237\u7aefPPPOE,\u8fd9\u6837\u6bcf\u623f\u95f4\u53ef\u4ee5\u5206\u914d\u4e00\u4e2a\u5e10\u6237\u5bc6\u7801,\u4fbf\u4e8e\u7ba1\u7406! \u8fd9\u6837\u7684\u8def\u7531\u5668\u4e0d\u52301\u5343\u5143.
\u3000\u3000\u8ba1\u7b97\u8d1f\u8377\uff1aP\u603b\uff1d6000\u00d725\uff1d150000W
\u3000\u3000Pjs=P\u603b\u00d7Kx=150000\u00d70.7=105000W
\u8ba1\u7b97\u7535\u6d41\uff1aI=P/U/\u221a3/cos\u03c6=105000/380/1.732/0.85=187.7A\uff1b
\u9009\u62e9\u7a7a\u6c14\u65ad\u8def\u5668\u7684\u989d\u5b9a\u7535\u6d41\u5e94\u662f\u8ba1\u7b97\u7535\u6d41\u76841.2\uff5e1.5\u500d\uff0cIn=1.2Ijs=26.5\u00d71.2=225.2A,
\u9009\u62e9225A\u7684\u5851\u58f3\u5f0f\u65ad\u8def\u5668,\u5982\uff1aCDM1-225/3300 In=225A\u3002
\u8003\u8651\u73af\u5883\u56e0\u7d20\u548c\u6577\u8bbe\u65b9\u5f0f\u7684\u5f71\u54cd\u755920\uff05\u7684\u4f59\u91cf\uff0c\u5373\uff1a187.7\u00d7\uff081+20\uff05\uff09=225.2A
\u9009\u62e970mm²\u7684\u5851\u6599\u94dc\u82af\u7535\u7ebf\uff0c\u5373\uff1aBV-4\u00d770+1\u00d735\uff0c\u5b83\u7684\u5b89\u5168\u8f7d\u6d41\u91cf\u662f265A\u3002
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