化学演讲
所属分类: 教育教学
发布于: 2018-10-24 03:13:18
浏览次数: 919
收藏
分享
点赞
描述
Magnesium is an important metal(material), it has a small density of 1.74g.cm-3But it has a high intensity, its hardness is used to build rockets, planes, and missiles. Which is necessary for cutti...
will.b
作品: 1 粉丝: 0
推荐作品
x