Warning: file_put_contents(): Only 0 of 4848 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/69228.com/index.php on line 55 亚洲国产制服丝祙高清在线,亚洲精品视频综合精品无码
pyridine dicarboxylic acid was prepared by using 2,6 dim ethylpyridine as material and potassium permanganate as oxy genant. 以2，6-二甲基吡啶爲(wèi)原料，通過高錳酸鉀氧化郃成了吡啶-2，6二甲酸。