然后,我就去看墙上的宣传图去了
终于明白了
下面,我现学现卖一回
假设A点是北京,B点是张家口,C点是青龙桥
目标是从A到B,路线最短,但是最难铺设铁路,要挖掘的山洞也相对多,上下坡也比较陡
当时的人力和机车的能力都达不到要求
现在,就利用C点迂回一下
就好比爬泰山走之字线似的
先从A点到C点
再从C点到B点
但是在C点并不是折返
而是利用2个机车头
我利用写字板画一个草图好了[whitepad]oval;124;19;1;1;21600,21600;;black;0.75;undefined|*72;127;***;#603;*undefined|*228;128;***;**undefined|**138;0;5;*;**undefined|shape;0;0;396;196;396,196;;** m230,140 l230,140,230,142,230,143,230,144,230,145,230,146,229,146,228,148,228,149,227,150,227,151,226,151,226,152,225,153,225,154,224,154,223,155,222,156,221,157,219,159 218,160,217,161,216,162,215,162,215,163,215,164,214,164 e|*0;0;***;** m230,141 l230,141,231,141,232,142,233,143,234,144,235,145,235,146,236,146,236,147,237,148,238,149,238,150,239,150,239,151,239,152,240,152,240,153,241,154,242,155,242,156 243,156,243,157,244,157,245,158,246,159,246,160,247,160,248,160 e|*0;0;***;** m226,160 l226,160,226,159,227,159,228,159,229,159,230,159,231,159,232,158,233,158,234,158,235,158,236,158,237,158,238,158,239,158,240,158,241,158,242,158,243,158 e|*0;0;***;** m63,141 l63,141,63,142,63,143,63,145,63,146,63,147,63,148,63,149,63,150,63,151,63,152,63,153,63,154,63,155,63,156,63,157,63,158,63,159,63,160,63,161 63,162,63,163,63,164,63,165,63,166,63,167,63,168 e|*0;0;***;** m64,140 l64,140,66,140,68,139,69,139,70,139,71,139,71,138,72,138,73,138,74,138,75,138,76,138,77,138,78,138,79,138,80,138,81,138,82,138,82,139,82,140 82,141,82,142,82,143,82,144,82,145,82,146,82,147,82,148,81,148,81,149,80,149,79,149,79,150,78,150,77,150,77,151,76,151,75,151,74,151,73,151 72,151,71,151,70,151,70,152,69,152,68,152,67,152,66,152,65,152,64,152,65,152,66,152,67,152,68,152,69,152,70,152,71,152,72,152,73,152,80,155 80,156,81,156,81,157,82,157,82,158,82,159,82,160,82,161,82,162,82,163,82,164,81,164,81,165,80,165,79,165,78,165,77,165,77,166,76,166,75,166 74,166,73,166,72,166,71,166,70,166,69,166,68,166,67,166,66,166,66,167,65,167 e|*0;0;***;** m130,28 l130,28,128,28,126,28,125,28,124,28,123,29,122,29,121,29,121,30,120,30,120,31,119,31,118,32,117,32,116,33,115,33,115,34,115,35,115,36,115,37 115,38,115,39,115,40,115,41,115,42,115,43,115,44,115,45,115,46,116,46,116,47,117,47,117,48,118,48,118,49,119,49,120,49,121,49,122,49,123,50 124,50,125,50,126,50,127,50,128,50,129,50,130,50,131,50,132,50,133,50,134,50,135,50,136,50 e|*0;0;***;** m232,129 l232,129,231,129,231,128,230,128,230,127,229,127,228,126,228,125,226,124,225,123,224,122,223,121,222,120,221,119,221,118,220,118,220,117,219,117,219,116,218,115 217,115,216,114,216,113,215,113,215,112,214,112,214,111,213,111,212,110,210,108,208,106,206,104,205,103,204,102,203,101,203,100,202,100,202,99,201,99,200,98 200,97,199,96,197,94,196,93,196,92,195,91,195,90,194,90,194,89,193,88,193,87,192,86,191,85,190,84,189,84,189,83,188,83,188,82,187,82,187,81 186,80,184,78,182,77,181,76,180,75,179,74,178,73,177,72,176,71,174,70,172,68,170,66,169,66,168,65,168,64,167,64,166,63,165,62,163,60,160,58 157,56,155,54,154,53,153,52,152,51,151,51,151,50,150,50,149,49,148,47,148,46,147,45,147,44,146,43,145,42,144,41,143,40,143,39,142,39,141,38 140,37,140,36,139,36,138,35,138,34,137,34,136,33,135,32,134,31,133,30,132,30,132,29,131,29,130,28,129,27,128,27,128,26,127,26,127,25,126,25 126,24,126,23,125,23,125,22,125,21,125,20,125,19,125,18,125,17,125,16,125,15,125,14,125,13,125,12,125,11,125,10,125,9,125,8,125,7,125,6 125,5,125,4,125,3,125,2,124,2,124,1 e|*0;0;***;** m126,22 l126,22,126,23,126,24,126,25,125,26,124,29,123,30,122,32,121,33,121,34,121,35,120,36,120,37,119,37,119,38,119,39,118,39,117,40,117,41,116,42 116,43,115,43,115,44,114,44,114,45,113,45,113,46,112,47,111,49,111,50,110,52,110,53,109,54,109,55,109,56,109,57,108,58,108,60,108,61,107,63 107,65,107,66,107,67,107,68,106,69,106,70,106,72,106,73,105,74,105,76,105,77,105,78,105,79,104,80,104,81,103,84,103,85,102,87,102,88,101,89 101,90,101,91,101,92,100,93,100,94,99,95,99,96,99,97,99,98,98,98,98,99,98,101,97,102,96,104,95,106,95,107,94,108,94,109,94,110,93,110 93,111,92,112,91,114,90,116,88,118,88,120,87,121,87,122,86,122,86,123,86,124,85,124,85,125,84,125,84,126,84,127,83,127,82,128,81,128,80,128 80,129,79,129,78,129,77,129,76,129,75,129,74,129,73,129 e[/whitepad] |