2022年8月24日
copper
摘要： Copper is a chemical element with the symbol Cu (from Latin: cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high t 阅读全文
posted @ 2022-08-24 12:48 华容道专家 阅读(360) 评论(0) 推荐(0)