Earlier the idea was proposed that single element consists of a collection of atoms identical in every way.

 
  • 更早些時(shí)候就提出了這樣的看法:一種元素是由各方面完全相同的原子聚集而成的。
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan