【简答题】(16分)有A、B、C三种短周期元素在周期表中相对位置如下图: A B C (1)A与C形成的液态化合物是常见的重要有机溶剂,则A、B、C三种元素最高价氧化物对应的水化物酸性由强到弱的顺序是: > > (用化学式表示)。 (2)X、Y为B、C两种元素形成的单质。标准状况下,X的密度为3.17g/L。Z是一种化合物,焰色反应呈紫色(透过钴玻璃),室温下0.1mol/LZ水溶液pH=13。X、Y、Z有...
【简答题】__1__ the end of the 16 th century English was only spoken by people from England. They were the native _2___(speak). Today, __3__ largest number of people speaking English may be in China because a l...