A:分离、提纯→确定化学式→确定实验式→确定结构式
B:分离、提纯→确定实验式→确定化学式→确定结构式
C:分离、提纯→确定结构式→确定实验式→确定化学式
D:确定化学式→确定实验式→确定结构式→分离、提纯
有关地球大小数据的叙述,正确的是( )
根据句意和汉语注释,写出单词的正确形式。(1)Guangdong is in the ____ (north) part of the city(2)She danced so ____ (beauty) that everyone clapped their hands.(3)Look! Their____ (wife) are waving to them(4)Do you think noise ____ (pollute) is a terrible problem?