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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 甲醛在一定条件下发生如下反应:2HCHO+NaOH(浓)→HCOONa+CH3OH,在此反应中,甲醛发生的变化是( ) - 33问答网