下列关于硅和二氧化硅的叙述不正确的是( ) A.晶体硅和二氧化硅晶体的结构都类似于金刚石 B.晶体硅和二氧化硅晶体都常用来制造电子元件 C.硅
When Duke University refused to accept Siobhan O’Dell, 17, by sending her a rejection letter, she refused to take it quietly. The teenager, from North Carolina, had applied to the famous college
Every child is ________, with their own needs, preferences and talents. A. original B. contradictory(对立的) C. similar
将下列各组物质按酸、碱、盐分类顺次排列,正确的是( ) A.硫酸、纯碱、石膏 B.硫酸、烧碱、绿矾 C.硫酸氢钠、生石灰、醋酸钠
据ETH天文研究所报告,组成太阳的气体中存在20Ne和22Ne,下列关于20Ne和22Ne的说法正确的是 A. 20Ne和22Ne互为同位素 B. 20Ne和22Ne互为同分异
为下面的句子填写词语,最恰当的一组是( ) (1)明月______了你的窗子 (2)你的心如小小的_______的城 (3)________诗歌的语言,是鉴赏诗歌的
When it comes to the civil war in Syria, the US government’s attitude towards it has experienced a(n)_______ change , which may have a positive effect on Syria present situation. A. superior
《新唐书·百官志》载:“两京诸市署:令一人,从六品上;丞二人,正八品上。掌财货交易,度量器物,辨其真伪轻重……凡市,日中击鼓三百以会众