1559| 7
|
请大家看看还有哪些元素是有益或有害的? |
| ||
| ||
点评
铜合金有害元素:铅铁硫铋砷锑氧氢
| ||
小黑屋|手机版|Archiver|机械必威体育网址 ( 京ICP备10217105号-1,京ICP证050210号,浙公网安备33038202004372号 )
GMT+8, 2024-12-23 16:08 , Processed in 0.049373 second(s), 16 queries , Gzip On.
Powered by Discuz! X3.4 Licensed
© 2001-2017 Comsenz Inc.