Warning: fopen(/www/wwwroot/www.wendadaohang.com/data/md5_content_title/44/44df09ed795b0bfe091d4393c93bec3f.txt): failed to open stream: No space left on device in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2468
Warning: flock() expects parameter 1 to be resource, bool given in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2469
Warning: fclose() expects parameter 1 to be resource, bool given in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2475 两包黑色固体,分别是氧化铜和木炭粉,如何鉴别,请写出实验方法和有关化学方程式 - www问答网