A:a
B:any
C:some
已知C5H11Br有8种同分异构体,则C6H12O2属于羧酸的结构有(不考虑立体异构)
假如你穿越时光隧道来到唐朝,你不可能经历的事情是( )
一 Do you know Yao Ming?
一 Yes, he is famous playing basketball and a basketball star·