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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 流体力学实验:孔口和管嘴出流实验,为什么局部阻力系数算出来之后有的大于0,有的小于0???急!!! - 55问答网