Warning: file_put_contents(/www/wwwroot/ppbbu/4cd.cn/cache/49b7d50f8c30659ea208e95d8c8e8a4c.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/4cd.cn/index.php on line 55 alloy silver powder例句_alloy silver powder英汉例句_alloy silver powder双解例句_沉淀汉英词典
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