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Warning: fclose() expects parameter 1 to be resource, bool given in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2475 甲乙两列火车同时从相距500千米的两地相对开出,4小时后没有相遇还相距20千米,已知甲车每小时行65千米, - www问答网