Warning: file_put_contents(): Only 0 of 6255 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/69228.com/index.php on line 55 alloy silver powder例句_alloy silver powder英汉例句_alloy silver powder双解例句_魏碑心思朗文词典
The leached out residue is reduced by sodium carbonate, then the gdd-silver alloy is decomposed by nitric acid, and finally zinc powder is used to replace silver. 浸出渣用碳酸钠还原，再用硝酸分解金银合金，然后用锌粉置换银。 ip.com