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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 我现在要在黄铜上面钻1.8的孔深1.30mm要求锥度很严格结果我发现钻出来的孔不圆呈三角状是什么原因 - www问答网